Nagios Support Forum

Can you post the configuration settings from the Nagios server for the Swap memory usage-CAT C and the Physical memory usage-CAT C so we can view them?

Hi,

Please check the command definitions of both Physical and swap memory configured in Nagios.

/usr/local/nagios/libexec/check_nrpe -H $HOSTADDRESS$ -p 5666 -c CheckMEM -a MaxWarn=$ARG1$% MaxCrit=$ARG2$% ShowAll type=physical
/usr/local/nagios/libexec/check_nrpe -H $HOSTADDRESS$ -p 5666 -c CheckMEM -a MaxWarn=$ARG1$% MaxCrit=$ARG2$% ShowAll type=paged

I don't know is your commands were copied over with some extra characters but the % in those 2 examples have to be removed and that should fix the error you are having.

yes, i have tried without % as well but still the same error.

[root@infsgdcngos02 libexec]# ./check_nrpe -H $HOSTADDRESS -p 5666 -c CheckMEM -a MaxWarn=80 MaxCrit=90 ShowAll type=physical
CHECK_NRPE: Socket timeout after 10 seconds.

Also i'm getting the same error when executing only with the host address.

[root@infsgdcngos02 libexec]# ./check_nrpe -H $HOSTADDRESS
CHECK_NRPE: Socket timeout after 10 seconds.

And to add on this, i can see the attached error on the server when nsclient is restarted. Also below entries are present in the nsclient log file.

2016-08-04 21:52:33: error:D:\source\nscp\modules\NRPEServer\NRPEServer.cpp:132: CA not found: C:\Program Files\NSClient++/security/ca.pem (generating a default CA)
2016-08-04 21:55:04: error:D:\source\nscp\modules\NRPEServer\NRPEServer.cpp:132: Certificate not found: C:\Program Files\NSClient++/security/certificate.pem (generating a default certificate)
2016-08-07 08:00:23: error:D:\source\nscp\include\nrpe/server/protocol.hpp:80: Rejected connection from: 10.234.40.36

The "Rejected connection from: 10.234.40.36" means that you need to add the IP address of the Nagios server to the allowed hosts section in the NSClient++ ini file on that windows system.
After adding the address, restart the NSClient service and that should allow the Nagios system to connect to the Windows host.

The IP address of the Nagios server is 10.211.26.68 and it is already added in the allowed hosts section of the nsclient configuration file.

This seems a strange address and i have tried adding the same as well. But no luck

Edit your nsclient.ini file and under this section Change the following from to Also, add the following 2 lines as well in that section Save the file and restart NSClient++ and see if that fixes it for you.

Hi,
A new finding..

We have the exact issue in 3 servers.
1. All 3 servers have IBM Clear Case installed
2. All 3 servers have an extended amount of “CLOSE_WAIT” port 5666 connection status
3. All 3 servers exhibit the same NRPE error in the Windows event logs
Finally found that all the 3 ClearCase servers are running their own copy of NRPE for Windows which is taking over the NRPE config/port for NSClient++ on these servers.
When we tested by stopping this particular service.. It worked The issue is, we are not sure if the NRPE windows service have any dependencies which we need to check with our client.

But my question here is NRPE windows is working on port 5667 and the NRPE port configured in NSC.ini file is 5666. Then why there is an overlap??

Please advise on this.

But my question here is NRPE windows is working on port 5667 and the NRPE port configured in NSC.ini file is 5666. Then why there is an overlap??

Port 5667 is used in NSClient++ for passive checks (NSCA).

I am glad your issue has been resolved. Is it all right if we lock this thread?