Nagios Support Forum

Using XI monitoring 900+ Hosts.

But now I have come across one weird problem is that, I have been monitoring C & D drive but suddenly Nagios started throwing false alerts in return I can see below error
Drive G: Disk Usage Return code of 139 is out of bounds


However, I have not configured G Drive, in any of my server.

Can you check which host this alert is coming from, then see if they have a service defined that could have a "G: Drive" check in it anywhere? If so are you checking against a windows or Linux server? That is a command which could mean a few things, the most common are a permissions change occurred or the permissions are wrong somewhere along the line, or the path Nagios is trying to run the command from, or to is incorrect.

It is window server & I have not configured G Drive anywhere.
Also in CCM, I can see the host but not able to see services associates with host. However services are seen in services tab.

Okay, so you cannot see the service in the CCM, have you checked the command line? To see if some configuration is stuck in a ghost state? The services are located at:
Are you running a plugin against that host which checks multiple drives at once?