There's also an existing plugin for this: check_user_count.bat <a href="http://exchange.nagios.org/directory/Plugins/Remote-Access/Count-number-of-terminal-server-sessions/details">http://exchange.nagios.org/directory/Plugins/Remote-Access/Count-number-of-terminal-server-sessions/details</a> However I suggest to use checkCounter, as Jim Avery mentioned it. That way you keep independent of additional files. <div class="gmail_quote">On Mon, Jan 23, 2012 at 2:54 PM, Robert Jackson <<a href="mailto:rab@walkermartyn.co.uk">rab@walkermartyn.co.uk</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Jim, Many thanks for the excellent reply. I'll give it a bash and see if I can get it going. <div><div></div><div class="h5"> -----Original Message----- From: Jim Avery [mailto:<a href="mailto:jim@jimavery.me.uk">jim@jimavery.me.uk</a>] Sent: Monday 23 January 2012 13:43 To: Nagios Users List Subject: <a href="mailto:rab@walkermartyn.co.uk">rab@walkermartyn.co.uk</a> - Re: [Nagios-users] Windows Active Sessions - Bayesian Filter detected spam On 23 January 2012 13:09, Robert Jackson <<a href="mailto:rab@walkermartyn.co.uk">rab@walkermartyn.co.uk</a>> wrote: > Does anyone know how to return the number of active sessions from a Windows > Terminal server? I have installed the NSClient++ service on the Windows > server and obviously have the NRPE plugin installed on my Nagios host. Rab, if I've understood correctly then you can query a Windows performance counter. I use an entry in the NSClient++ config file in the [External Alias] section that looks like this:- alias_CheckCounter-ts_act_sess=CheckCounter "Counter:sessions=\Terminal Services\Active Sessions" ShowAll MaxWarn=40 MaxCrit=50 Then on the Nagios side, the command is simply check_nrpe -H thehostname -c alias_CheckCounter-ts_act_sess So the command definition in Nagios is:- define command{ command_name check_nrpe command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -u $ARG1$ } And the service definition looks something like this:- define service{ use srv-pnp,generic-service host_name myhost service_description TS_Active_Sessions check_command check_nrpe!-c ts_act_sess notes Number of Terminal Services Active Sessions contact_groups notify-engineers } There are lots of similar ways to do this sort of think using NSClient++. Precisely how you set it up depends a bit on how obsessive you are about security and your particular preference. The method shown above means you can have allow_arguments=0 and allow_nasty_meta_chars=0 in the [nrpe] section which is good for security. The downside is that if you need to change the warning theshold, you have to edit the nsc.ini file on the target system. hth, Jim ------------------------------------------------------------------------ ------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. 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Free future releases when you subscribe now! <a href="http://p.sf.net/sfu/learndevnow-dev2" target="_blank">http://p.sf.net/sfu/learndevnow-dev2</a> _______________________________________________ Nagios-users mailing list <a href="mailto:Nagios-users@lists.sourceforge.net">Nagios-users@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/nagios-users" target="_blank">https://lists.sourceforge.net/lists/listinfo/nagios-users</a> ::: Please include Nagios version, plugin version (-v) and OS when reporting any issue. ::: Messages without supporting info will risk being sent to /dev/null </div></div></blockquote></div>