Nagios Support Forum

sort: cannot create temporary file in '/tmp': No space left on device
ls -l /tmp
What files are there filling the FS?

Filling up a filespace isn't really a nagios issue and the following message isn't very hard to understand.
sort: cannot create temporary file in '/tmp': No space left on device

If you can ping the host and the port is open you have an odbc connection issue. Often a uname/pasword issue.

Delete the .rrd and .xml measurement files.

What does a search say about?
mod_wsgi (pid=1883788): Failed to exec Python script file '/usr/local/nsti/wsgi.py' error occurred in /var/log/httpd/error_log file.

Use the shell and define a service manually. Wizards make services rather badly so while they're a good learning tool, they aren't good for defining generalized services. Learn about how nagios is supposed to work, and don't depend on wizards. Use templates and hostgroups to generalize services so t...

Typically a host check is defined to ping the host to see if it is reachable. You can use a different check but something standardized is somewhat normal and ping/icmp is the usual way. You need an am I alive check to tell the system to continue checks. The main cfg can fail all other checks or not ...

Do you mean whitelist the proxy inside Nagios or on network security side? The nagios server needs to connect to a nagios web server on the internet to check the license status. If it can't connect to that site the license check will fail. The nagios server has a proxy setting in the admin section....

Check your proxy settings and whitelist.

I think you'll need to figure out what service is creating the issue and why the arg list is so long. The error is from the shell, suggesting the service command runs a shell script, and isn't really a nagios issue.