Hey all, I just installed Nagios and I'm getting some servers configured for monitoring. My question is regarding my Exchange server. Nagios is successfully monitoring (using NSClient++) two services, imaps and smtp. There are two other services Nagios is trying to monitor, IMAP Procs and Mail Queue, and the status of those two services is "Connection refused by host." I tried looking for this issue here on the forums but I couldn't find anything. I can't understand why Nagios only works partially. I'll go ahead and start adding some other Windows servers into the mix and see what happens. FWIW my Debian and CentOS servers are looking good.