Nagios warning alerts

[Riyazbaba366]

Suddenly nagios is showing warning alert for so many servers stating nagios has not received an alert from server

[kg2857]

You'll need to provide more info and maybe ask a question if you want help.

[Riyazbaba366]

I have ran command systemctl restart nagios and after doing that nagios gui is showing unable to get process status I have checked the status from server end it is showing running and enabled . Can anyone help me to troubleshoot the issue?

[kg2857]

That isn't adding any info.