Nrpe Port 5666

In order to execute Nagios plugins that monitors various system services and metrics on a remote host, you need to install Nagios Remote Plugin Executor (NRPE). If you have any firewalls blocking that port, be sure to open it to your Nagios server. In this tutorial we will learn How to install and configure nagios nrpe in CentOS and Red Hat. 12 Open Port 5666 on Firewall Make sure to open port 5666 on the firewall of the remote server so that the Nagios monitoring server can access the NRPE daemon. A few days ago I submitted to Nagios Exchange a new plugin to check KLMS health, so if you use Kaspersky Security for Linux Mail Server, it might be of use to you. Nrpe, or Nagios Remote Plugin Executor, is the client side service of a monitoring setup. command_timeout=60;;# COMMAND ARGUMENT PROCESSING. Another really helpful check for your Icinga or Nagios instance. NRPE allows one to execute Nagios plugins installed on remote hosts, and integrate them with an existing Nagios server. Add the NRPE port to /etc/services: vi /etc/services. The results of the check_disk command will be returned back by NRPE daemon to the check_nrpe on nagios-server. nagios-plugins 1. If the /var/log/puremgr_agent. Son principe de fonctionnement est simple : il suffi t d’installer le démon sur la machine distante et de l’interroger à partir du serveur Nagios. server_address=192. NRPE works much like NRPE for unix (if you are familiar with it) and in short you can say it relays a plugin request to a remote server. If new NRPE commands are added, this file must be modified. As you can see, it uses NRPE to make TCP connections to port 5666 and run command 'usedspace_php', which we defined in /etc/nagios/nrpe. There is a check_by_ssh plugin that allows you to do this. iptables -N NRPE iptables -I INPUT -s 0/0 -p tcp --dport 5666 -j NRPE iptables -I NRPE -s 198. A colon-separated list of commands to be. Not shown: 998 closed ports PORT STATE SERVICE 22/tcp open ssh 5666/tcp open nrpe. NRPE is called as ‘Nagios Remote Plugin Executere’. configure nrpe. In this tutorial we will learn How to install and configure nagios nrpe in CentOS and Red Hat. command_timeout=60;;# COMMAND ARGUMENT PROCESSING. # # To mitigate this vulnerbility, edit your agent. Reader will apply concept or execute command at their own risk. But the plugins is the version 1. Make sure both the NRPE daemon and the check_nrpe plugin were compiled with SSL support and that neither are being run without SSL support (using command line switches). On a linux server I am unable to monitor a working server that has all of a sudden reported it cannot connect. Hope that makes sense. But what's the port that nagios uses to make this query? When the target host replies back to Nagios, what port does the sy…. Most of the system administrators write custom shell scripts to do basic monitoring and sends email in case services crosses. Add “nagios” user as “/usr/local/nagios” as home directory. Linux server monitoring with SNMPv3 An alternative path as we recommend today is to use the SNMP (v3) protocol to monitor Linux hosts for added security. Jun 13 15:12:21 myserver nrpe[3667]: Continuing with errors All of the server configs are under /etc/nagios/nrpe. 15]# vim /etc/services nrpe 5666/tcp NRPE. Now open /etc/xinetd. by brandon pal. Add Host to Nagios Server Configuration. 5666 and will search for argument in /etc/nagios/nrpe. Follow through this guide to learn how to install Nagios NRPE agent on CentOS 8. This tutorial requires existing Nagios server to be up and running and root privileges for Nagios server and remote Linux host. Port 5666 TCP NRPE (Nagios) Unofficial Un-Encrypted App Risk 4 Packet Captures Edit / Improve This Page! NRPE (Nagios) NRPE (Nagios) 126 Position 1 Contributor 5,369 Views Tags: External Links: None yet. And when the monitoring host hits the puppet host using tcp v4 it can’t because only tcp v6 is active on that port. /check_nrpe -H -p 5666 -c runcmd -a spooler“(Replace the Host IP address with the client computer) If its working fine you should get the reply like this: The Print Spooler service is stopping. This allows you to bind to particular IPs in situations where the system has more than one IP. Nagios Core was originally designed to run under Linux, although it should work under most other unices as well. Cross-Region: Redundant VPN between Regions with Openswan and Nagios NRPE else its most likely port 5666. #chkconfig nrpe on. This has been tested on AIX version 6. Nagios nrpe with argument passing = The address of the host running the NRPE daemon [port] = The port on which the daemon is running (default=5666. And when the monitoring host hits the puppet host using tcp v4 it can’t because only tcp v6 is active on that port. Line 1 ##### 2 # Sample NRPE Config File : 3 # Written by: Ethan Galstad ([email protected] Use "netstat -an" to verify that something is listening on port 5666. # # To mitigate this vulnerbility, edit your agent. Add your Nagios server IP to /etc/nagios/nrpe. 04 box i when i try to install NRPE on Unix Box i found this error 1- first step for installation. Make sure both the NRPE daemon and the check_nrpe plugin were compiled with SSL support and that neither are being run without SSL support (using command line switches). INSTALLATION: This installation is to be repeated in each server you wish to monitor. When I ran "check_nrpe -H remote_client" on monitor host, it returns the result of NRPE version of remote client. 2 # yum install -y nagios-plugins-all nrpe net-snmp Edit /etc/nagios/nrpe. READ: Install and Configure Nagios 4. Post by Kahlon, Robby If you are using NRPE, you will need to open TCP port 5666. This tutorial will cover how to set up NRPE on an existing Nagios deployment. It also means that there's a clean connection between the two servers and that the monitored host's port 5666 is opened and listening. nagios-plugin | The UNIX and Linux Forums. NSClient++ does not yet support Raspbian for now. cfg) to add the IP of your Nagios server (in this example, 192. Conclusion. Posted by Tomas Hlavacek at 7/12/2011 12:35:00 PM No comments:. Yes we can get this port from host config like address during command execution, anyway we need to give -p in command conf - saravanakumar Jun 14 '16 at 9:59. # NRPE in SuperDocter 5, which is their monitoring utility for SuperMicro chassis'. Conclusion. Standalone NRPE vs Under XINETD. Initial Set Up. ## Warning status when load average exceeds 1, 2 and 1 for 1, 5, 15 minute interval, respectively. Add your Nagios server IP to /etc/nagios/nrpe. Make sure that the paths to the nrpe binary and nrpe. We'll name this command as check_nrpe_firewalled. This is dedicated to the linux users, system admins, open source enthusiastic, techs whoever is looking for solution, tricks & concept etc. Monitoring is an essential part of managing infrastructure. 006614 # Nagios NRPE Querying Google for Nagios NRPE gives result, more or less similar, and is mentioned below. 6 server which is running on fedora 5. Also note that NRPE will be listening on port 5666 because server_port=5666. This is a grooving process before it was all manual but slowly we are getting a more “automated” installation process so hopefully this will keep improving in the future as well and some of the steps might go away. [1] Install nrpe on Nagios server and on remote server you'd like to watch. NRPE has a configuration option dont_blame_nrpe which enables command-line arguments to be provided remote plugins. The following presumes you know the IP of the Nagios Server and will open access to ‘JUST’ that system:. cfg add the IP of the nrpe and the nagios server allowed_hosts=127. Suppose the nrpe daemon receives a query from the nagios server, to execute a command on the local server, nrpe daemon looks inside the nrpe configuration files, for a command with the same name what nagios asked to run. Monitor remote machine with Icinga on CentOS 7. 6) Testing the access by OpMon From the OpMon console, we can check te NRPE communication when running the next command, placing the IP_DO_SERVIDOR, where we just installed the agent. 00040s latency). Port 161 is used to send requests to nodes and post 162 is used to receive results. Port 5666 is the NRPE port on the client side. snmp, ports 161 and 162 − snmp is an important part of network monitoring. A colon-separated list of commands to be. local add nrpe3_enable=”YES” Edit configfile: /usr/local/etc/nrpe. cfg add the IP of the nrpe and the nagios server allowed_hosts=127. I can change the port in nrpe. The results of the check_disk command will be returned back by NRPE daemon to the check_nrpe on nagios-server. If new NRPE commands are added, this file must be modified. NRPE will allow Nagios to execute commands on remote Linux machines and get the command output back to Nagios Server. cfg as above. My firewall is open for port 5666 in TCP and UDP. Jak zwykle coś musi być nie tak. x on Ubuntu 18. Current service contain the biggest tcp udp port list. x (which is the server's IP address). Also note that NRPE will be listening on port 5666 because server_port=5666. Let's restart NRPE: $ sudo service nagios-nrpe-server restart Now that we've done installing and configuring NRPE on the hosts that we want to monitor, we will have to add these hosts to our Nagios server configuration before it will start monitoring them. Installing nagios plugin and NRPE on Solaris 10. port=5666;;# COMMAND TIMEOUT; This specifies the maximum number of seconds that the NRPE daemon will allow plug-ins to finish executing before killing them off. x on Ubuntu 18. cfg with these 2 values server_address=127. NOTE: If you run nrpe under inetd or xinetd, the server_port and allowed_hosts variables in the nrpe configuration file are ignored. /configure --enable-ssl make all make install-plugin make install-daemon make install-daemon-config add the 5666 port no in /etc/services Add the nagios host IP in the Allowed Host Directive of the nrpe. 3 – edit nrpe. Add your Nagios server IP to /etc/nagios/nrpe. Port Number List Of Services Matching NRPE I searched my database for all services matching " nrpe " and below are the matches. # NOTE: This option is ignored if NRPE is running under either inetd or xinetd server_port=5666 # SERVER ADDRESS # Address that nrpe should bind to in case there are more than one interface # and you do not want nrpe to bind on all interfaces. Occasionally the Nagios server is unable to connect to an NRPE agent on one of the monitored machines. NRPE starts up but errors out here: Jun 13 15:12:21 myserver nrpe[3667]: Could not open config directory '/etc/nagios/nrpe. allow Add the line nrpe: 17. rsync and nrpe from that machine only using the following commands (in Openstack, as an example - will vary by provider) so that you are only opening them to the specific server, rather than any IP: nova secgroup-add-rule juju-${JUJU_ENV} tcp 873 873 10. After make sure, it is running and listening on port 5666 netstat -l If you also want to make it more secure, configure your Iptables to allow only your Nagios server to communicate with your local machine even the nrpe server already had that configuration. If the /var/log/puremgr_agent. Test NRPE Client / Agent This will test that the NRPE Client / Agent is properly installed and listening on port 5666. Install Percona Monitoring Tools for Nagios - MySQL Plugins Recently a friend asked about Installing Percona Monitoring Tools for Nagios as he was facing a few issues. # firewall-cmd --zone=public --add-port=5666/tcp --permanent # firewall-cmd --reload To verify if the NRPE daemon in the remote host is functioning as expected, just execute the following "check_nrpe" command from the terminal of. Restart NRPE to put the change into effect: systemctl start nrpe. Must i also forward port 5666/tcp to the SME 8 servers Also what do i do in: ===== Allow the central Nagios server to access the NRPE service cp -s /etc/init. The following is a list of custom commands that can be used with NRPE. server_port=5666 # SERVER ADDRESS # Address that nrpe should bind to in case there are more than one # interface # and you do not want nrpe to bind on all interfaces. Greetings Wanderer! In our previous post, we saw how to install Nagios from source. The central problem seems to be that the monitoring host can't hit nrpe on port 5666 UDP. NRPE is the most common way to connect to NSClient. Add Host to Nagios Server Configuration. x port 5666: No route to host connect to host x. cfg, we setup a version of the check_nrpe command that will check for localhost port 34345 (the ssh tunnel) instead of the client's ip at port 5666, that is firewalled. cfg and add the following entry to it. Make sure that NRPE port is allowed all the way to the remote host. 注意:nrpe daemon需要Nagios-plugins插件的支持,否则daemon不能做任何监控. command_timeout=60;;# COMMAND ARGUMENT PROCESSING. First, enable the NRPE usage in Nagios. Lorsqu'un port tcp/ip est à l'écoute, il est parfois utile de savoir quel est le process correspondant. Port 5666 is the NRPE port on the client side. allow Add the line nrpe: 17. The Nagios Remote Plugin Executor (NRPE) is installed to allow a central Nagios server to actively poll information from the hosts it monitors. There is a clear problem this time, the service fails to start after a timeout saying it cannot create the pid file. Howto remote monitor cPanel with Nagios via installing NRPE. 3 has more checks that can be done but it requires two server_ports to be open, ports 5666 and 12489. So I thought that the problem was that xinetd was listening to port 5666 only on tcp v6. 006614 # Nagios NRPE Querying Google for Nagios NRPE gives result, more or less similar, and is mentioned below. dIl willlisten to. service nrpe start 2. This is a grooving process before it was all manual but slowly we are getting a more "automated" installation process so hopefully this will keep improving in the future as well and some of the steps might go away. Submit Your Nagios Project! Help build Nagios Exchange for yourself and the entire the Nagios Community by your Nagios project to the site. Now we have a Container which we are monitoring using Nagios so Follow the below commands on Nagios server to configure the monitoring. cfg) through Shorewall (in /etc/shorewall/rules ) through to monitoring hosts. It can be used with Linux as well as other Unix variants, however we are going to create nagios plugins with Python on CentOS 6. Initial Set Up. NRPE is the most common way to connect to NSClient. 00043s latency). Make sure the NRPE config file (nrpe. Standalone NRPE vs Under XINETD. sudo sh -c "sudo echo 'nrpe 5666/tcp' >> /etc/services" Install Service / Daemon Port 5666 is used by NRPE and needs to be opened on the local firewall. For Red Hat Enterprise Linux 6-based systems, complete the following steps:. if it works, but with args not, then its most likely the. Install Nagios NRPE from source code on CentOS or Debian. My firewall is open for port 5666 in TCP and UDP. Make sure that NRPE port is allowed all the way to the remote host. I’ll try to build up this ‘how to’ from the ground, starting with using the standard traditional method, which is using the official Nagios NRPE Agent. 4, is the pre-compiled one which I directly downloaded from internet, as I had problem on compiling nagios-plugins. It watches hosts and services that you specify, alerting you when things go bad and when they get better. 201 -p tcp --dport 5666 -j ACCEPT. First, enable the NRPE usage in Nagios. Using NSClient++ with check_nrpe#. cfg located at the remote servers. Next, we need to tell Nagios about the Openbravo server we want to monitor. server_port=5666 # SERVER ADDRESS # Address that nrpe should bind to in case there are more than one interface # and you do not want nrpe to bind on all interfaces. Usually we see the error “CHECK_NRPE: Error – Could not complete SSL handshake”. I wanted some more info when logging into my LinuxAMI in AWS, here is my motd-script: Install Nagios and NRPE: else its most likely port 5666. nrpe daemon:运行在远程主机上,通常是被监控端agent. server_port=5666. I have installed NRPE in two servers. 0 on Red Hat Server. cfg located at the remote servers. If you use your remote host's NRPE server as a NRPE node proxy (sending all checks for the network segment to a single NRPE enabled server behind a firewall), or if you are doing a large number of NRPE checks in relatively short time period on one remote host, you may hit the maximum connection limit of NRPE. In the following three chapters, I'll explain how to monitor a remote Linux host and the various services running on the remote host. Create an ACL in your firewall for NRPE (Firewalld or IPtables). nrpe daemon binds to port 5666. Purpose : Example, I have more then 10 linux server. In Fedora and Red Hat Linux, you would use the following commands: # iptables -I RH-Firewall-1-INPUT -p tcp -m tcp -dport 5666 -j ACCEPT # service iptables save. Restart NRPE to put the change into effect: systemctl start nrpe. nrpe (server) listens on port 5666 by default when it's run, and the client talks to this to run commands remotely. A Message From The Founder As the founder of Nagios, I'm asking for your help in a cause that's dear to my heart. I didn't see anyone mention this above. 8 has been installed. The following command is executed on a Nagios Core server and the computer running the NPRE Client / Agent has the ip address 192. /check_nrpe -H 192. d/nrpe with white space and restarted nrpe but it did not make any difference. So I need to create a different set of commands for nagios server to connect that nrpe client on different port. 3: Nagios/nrpe how to : For this session, I am demonstrating a basic Nagios set up of nrpe. PORT NUMBER Port number we should wait for connections on. Hence the nrpe (port no. I'm launching a new project to help better the world by providing the information, ideas, and inspiration that I believe can improve the lives of people everywhere. SSL is disabled. The central problem seems to be that the monitoring host can't hit nrpe on port 5666 UDP. vim /etc/services nrpe 5666/tcp # NRPE Service Allow NRPE through firewall. 1 By default client NRPE will listen on port 5666, so make sure it’s enabled on IPTABLES. ;port=5666;;# COMMAND TIMEOUT; This specifies the maximum number of seconds that the NRPE daemon will allow plug-ins to finish executing before killing them off. Administrator can login into Nagios through SSH whenever they feel to do so and perform checks. 9 of them listen port 5666 , but only one of them listen port 15666. service - Nagios Remote Program Executor. cfg) to add the IP of your Nagios server (in this example, 192. cfg on that remote host. connect to address x. It can be used with Linux as well as other Unix variants, however we are going to create nagios plugins with Python on CentOS 6. dll will listen to. Nagios on its exchange website states that:. 102) to the allowed_hosts line allowed_hosts=127. Administrator can login into Nagios through SSH whenever they feel to do so and perform checks. I have opened port 5666 on the firewall on the remote side as well as on the Windows firewall. determines which SSL messages are send to syslog. 00043s latency). 10/32 nova secgroup-add-rule juju-${JUJU_ENV} tcp 5666 5666 10. Monitored machines run an ‘NRPE agent’ which listens for requests to execute monitoring checks. 3 installation from the repositories. port = 5666 These settings define the ciphers allowable, whether NSClient++ accepts arguments and normally illegal characters and the port upon which it listens. It’s really simple to configure NRPE to run under xinetd in Linux. d/nrpe service nrpe {flags = REUSE socket_type = stream port = 5666 wait = no user = nagios. The variable server_port defines the port the nrpe will listen on. Login to the nagios host, e. CentOS 7 momentami przekleństwo, bo coś co zawsze działało nie działa wcale, albo od d***y strony. Adding allowed list to nrpe. From the trust that forms the basis of Web commerce to the anti-trust concerns of smaller Web-based businesses, many of the current up-in-the-air issues on the Web will find their way to the Federal Trade Commission in Washington, D. 2) NRPE 설정확인 [[email protected] ~]# netstat -at | grep nrpe tcp 0 0 *:nrpe *:* LISTEN. To solve this problem,We need to add port number 5666 to firewall. NRPE is a functional extension of Nagios, which can execute plug-ins on remote Linux/Unix hosts. Hey guys, i am troubleshooting since 2 days now and i can't see the light at the end of the tunnel. Apache Localhost Refused To Connect. NRPE/server] allowed hosts = 192. 监控服务器上可以用check_nrpe的来添加监控命令,可以在命令行中先测试,然后再通过centreon添加,或直接手动添加。 #. Le module NRPEListener est le serveur de requéte sur le port 5666. ALLOWED HOST ADDRESSES This is a comma-delimited list of IP address of hosts that are allowed. # service nrpe start # chkconfig nrpe on If the service fails to start there may be an issue with your config file, just run a tail /var/log/messages and see what it says. nrpe 5666/tcp # NRPE The run make install-inetd to copy the appropriate file, or add the appropriate line to your /etc/inetd. Install nrpe on remote host and make Nagios to be able to watch services on remote host. In this Article we are going to see how to install NRPE and configure Linux host monitoring. Nagios should start checking RAM usage of a remote-server using NRPE. server_port=5666. Test nrpe with netstat -at | grep nrpe Edit TCP wrappers vi /etc/hosts. Nagios can already be used to directly monitor the XCP dom0 host's external services, however, if you wish to do more than just ping the dom0 host, you can install Nagios NRPE on the XCP dom0 directly. Create an ACL in your firewall for NRPE (Firewalld or IPtables). Hello I'm sorry for my pour english, but I have a problem. If you configured everything correctly, you will see something similar to NRPE v2. "Check_nrpe -H localhost" works fine in Nagios server and in a client. 1 localhost Next, open /etc/services file add the following entry for the NRPE daemon at the bottom of the file. I had already added some windows clients and monitoring it. However, the scripts and plugins needed to monitor memory usage do not come with stock Nagios. NRPE works much like NRPE for unix (if you are familiar with it) and in short you can say it relays a plugin request to a remote server. Hence the nrpe (port no. Port 161 is used to send requests to nodes and post 162 is used to receive results. On the monitored host the nrpe daemon runs on default port 5666 and when it receives the command from the Nagios server, it checks its config file for the corresponding command in /etc/nagios/nrpe. Next, configure the firewall to allow nrpe traffic. service - Nagios Remote Program Executor. pl -M -w 95,90 -c 100,95. Purpose : Example, I have more then 10 linux server. While there are a set of basic default ports for Nagios, Nagios is highly configurable, and an administrator may use non-default ports should they so choose. Connections from all other IPs will be rejected. 1 edit /etc/services add the line nrpe 5666/tcp Restart xinetd daemon with service xinetd restart Test NRPE. ss} define service{use generic-service,srv-pnp host_name host104 service_description Disk C check_command check_nrpe!CheckDriveSize -a ShowAll MinWarnFree=10% MinCritFree=5% Drive=c:} define service{use generic-service,srv-pnp host_name host104 service. 00043s latency). In Fedora and Red Hat Linux, you would use the following commands: # iptables -I RH-Firewall-1-INPUT -p tcp -m tcp –dport 5666 -j ACCEPT # service iptables save. 196 -p 5666 -c my_udp_check -a 445. How to configure nrpe under xinetd. d/nrpe with white space and restarted nrpe but it did not make any difference. Now command should be look like:. This script attempts to execute the stock list of commands that are enabled. Please do not forget that this port needs to be opened in the firewall! The variables nrpe_user and nrpe_group control the effective user and group IDs the nrpe will be run under. Nagios for Network Admins: Ports and Protocols This document is intended to provide Nagios Network Admins with the ports they need. Table of ContentsPrerequisitiesInstall Nagios NRPEInstall Nagios PluginsAllow Nagios Server connectionsRestart xinetd and enable by defaultFinally try to issue nrpe command from the Nagios server We are assuming that our Nagios Server has IP: 192. cfg file located on the remote host contains the commands that are needed to check the services on the remote host. Usually we see the error “CHECK_NRPE: Error – Could not complete SSL handshake”. Univention Bugzilla – Bug 44454. At this point, with nrpe listening and port 5666 open we can manually run check_nrpe on the Nagios server to test the connection to our CentOS server:. restart the NRPE service. This is the same recipe that I use for all of my CentOS 6 servers - and works there. cfg with these 2 values server_address=127. I had already added some windows clients and monitoring it. /check_nrpe -H 192. But the plugins is the version 1. Ok so now you are facing issue with only nrpe connection,in this case you have to only review your config file, there is no relation of permissions. 2, "Configure Nagios to Monitor OpenStack Services". // This services uses "check_nrpe" to connect to port 5666 of the targeted "Win7" hosts and has it execute the "alias_mem" alias object Service "memory" { import. - Despues configuramos las entradas del daemon NRPE ya sea en inetd o xinetd, yo utilice inetd NOTA - Si ejecutamos nrpe en inetd o xinetd, las variables server_port y allowed_hosts en el archivo de configuración del nrpe serán ignoradas. Posted by Jarrod on April 1, 2015 Leave a comment (4) Confirm that NRPE is correctly listening on port 5666. 1 # NRPE USER # This determines the effective user that the NRPE daemon should. cfg file in a text editor and add the following line to define the command in NRPE. Test NRPE Client / Agent This will test that the NRPE Client / Agent is properly installed and listening on port 5666. allowed_hosts = $ server_port = 5666. Here's how to install it. OR values together to specify multiple options. There are multiple ways to achieve this. Similarly you can add other commands to check. NSClient++ does not yet support Raspbian for now. d/nrpe add the name of the Nagios server to the line only_from = 127. These commands are defined in the file /etc/nagios/nrpe. For Red Hat Enterprise Linux 6-based systems, complete the following steps:. Open Port 5666 on Firewall. Reader will apply concept or execute command at their own risk. cfg にて「server_port=5666」で設定されています。) 監視マネージャ側の設定. So you have to edit the nrpe. DESCRIPTION ----- NRPE expects definitions of commands in nrpe. Pour le port 22, tout admin système sait que c'est ssh, mais certains ports ne peuvent pas se deviner. Hello, I am trying to monitor a host in the Amazon EC2 cloud. The common way is to have nrpe started by inetd. I wanted some more info when logging into my LinuxAMI in AWS, here is my motd-script: Install Nagios and NRPE: else its most likely port 5666. Sometimes, the status such as disk usage of remote machines needs to be monitored. 3 is the IP of the host to monitor:. cfg file in a text editor and add the following line to define the command in NRPE. NRPE works much like NRPE for unix (if you are familiar with it) and in short you can say it relays a plugin request to a remote server. I can also not telnet to 5666 from the remote or indeed the localhost. xinetd[11497]: service/protocol combination not in /etc/services: nrpe/tcp. Interview question related to NRPE and how to add Linux client in nagios. If so all you need to do is edit /etc/services and add the following line right above the cvsup entries. 4) IPTables. cfg as you like and whatever you want to monitor then, chmod 644 /etc/nrpe. As long as. So far I can only see how to open one port or the other in the nrpe. log log file on the RHEL guest operating system shows a message that the installation of xinetd failed, manually install xinetd by using the following command: yum install xinetd; Use the following command to verify that the configuration on RHEL guest operating system on the PurePower System™ is correct:. cfg as above. NRPE is also available for windows servers. nrpe installation. /check_nrpe -H IP Connection refused by host. I can also not telnet to 5666 from the remote or indeed the localhost. In my job, the first problem I face is the binaries. Monitoring NRPE in Centos 7 Client. 6) Testing the access by OpMon From the OpMon console, we can check te NRPE communication when running the next command, placing the IP_DO_SERVIDOR, where we just installed the agent. If your have any windows machines you can check the Windows Update-State. Nagios Monitoring Host Server Setup. Separate multiple addresses with commas, but avoid using whitespace. There is a check_by_ssh plugin that allows you to do this. Open Port 5666 on Firewall Make sure to open port 5666 on the firewall of the remote server so that the Nagios monitoring server can access the NRPE daemon. And when the monitoring host hits the puppet host using tcp v4 it can’t because only tcp v6 is active on that port. Allow port 5666 (or whatever port you've specified for nrpe in /etc/nrpe. # NOTE: This option is ignored if NRPE is running under either inetd or xinetd server_port= 5666 # SERVER ADDRESS # Address that nrpe should bind to in case there are more than one interface # and you do not want nrpe to bind on all interfaces. SG Ports Services and Protocols - Port 5666 tcp/udp information, official and unofficial assignments, known security risks, trojans and applications use. Univention Bugzilla – Bug 44454.