Required open ports?

[jimingg]

Hi all, first post.
I've been given the responsibility of maintaining our Nagios monitoring after the guy who set it up left.
His notes are woeful.
It's Nagios Core 3.2.0
I've added a few local servers (all windows) with no issues.
Just added two smtp servers that are virtual windows boxes at a remote location and I get 'CRITICAL - Socket timeout after 10 seconds ' errors on both

I can ping them ok from the Nagios box.

Any ideas please as to what ports I have to ensure are open?

Many thanks
Jim

[jsmurphy]

Assuming you are running the check_smtp plugin from the nagios box to check SMTP the only port that needs to be open for that is 25... to test that it should be working do a telnet from the nagios box to port 25 on the SMTP server. If it accepts the connection then it should be working, so it may be a configuration issue.

[jimingg]

Thank you, mentioning telnet gave me the clue.
I had to ensure that port 12489 was clear (I hadn't mentioned in my post that it was nsclient++ that was installed on the Windows clients).
When I was able to telnet to 12489 the rest of it clicked into place and worked.
Thanks

[jsmurphy]

Glad you found the issue!