NSClient hangs randomly

[Robby Brewer]

I could not find any info searching the archive.  Has anyone had an issue with NSClient hanging occasionally?  Check_nt running against NSClient on a Windows Exchange server mostly works.  Occasionally though it appears that the service hangs.  All requests timeout both via the console and via the command line.  I have tried increasing the timeout value to 30 and even 60 seconds, but once the service appears to hang it will not return any results.  Stopping and restarting the service clears everything up until the next hang.  This is occurring as frequently as a few times a day, but not every day.  When NSClient is not returning anything I can telnet to port 1248:

[root at nagiosconsole libexec]# ./check_nt -H corp.ud.com -p 1248 -t 60 -v USEDDISKSPACE -l C -w 80 -c 90
No data was recieved from host!

[root at nagiosconsole root]# telnet corp.ud.com 1248
Trying 10.10.0.207...
Connected to exchange.corp.ud.com (10.10.0.207).
Escape character is '^]'.

----------------------------------------
After restarting the service
----------------------------------------
[root at nagiosconsole libexec]# ./check_nt -H exchange.corp.ud.com -p 1248 -t 30 -v USEDDISKSPACE -l C -w 80 -c 90
C:\ - total: 67.72 Gb - used: 45.63 Gb (67%) - free 22.09 Gb (33%)

We have completely uninstalled and reinstalled NSClient, but get the same behavior.  The windows event viewer does not show anything interesting.  This occurs using both version 1.06.02 and 2.01.  Any ideas?  Thanks in advance.


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Robby Brewer
Senior Support Engineer
United Devices
512-692-4126
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