The TCP port 12489 is the default port for using check_nt not for all the services offered by nsclient.
If you want to change the default port, you can do this in the file nsclient.ini.
You would have something like this :
<snip>
[/settings/NSClient/server]
; ENABLE SSL ENCRYPTION - This option controls if SSL should be enabled.
use ssl = 0
; PERFORMANCE DATA - Send performance data back to Nagios (set this to 0 to remove all performance data).
performance data = 1
; PORT NUMBER - Port to use for check_nt.
port = 12489 <= CHANGE HERE TO HAVE YOUR NEW LISTENING PORT
<snip>
After, don't forget to restart your service. And test with netstat to be sure your new port is correctly opened.
The TCP port 12489 is the default port for using check_nt not for all the services offered by nsclient.
If you want to change the default port, you can do this in the file
nsclient.ini.You would have something like this :
After, don't forget to restart your service. And test with
netstatto be sure your new port is correctly opened.