Monitor in Unknown status

[tincboy]

I had a two node ceph cluster, It was working fine, but after adding new node to ceph cluster and there for joining it to proxmox cluster, one of my previous monitors went into unknown status despite it's running.
Also the new monitor is in unknow status too.
Please check the attached picture for better understanding.
Any suggestion on what can be the cause of this issue?

 

[tincboy]

I guess it's monitor connection issue, because monitor service is up and running.
Any help on how to troubleshoot it would be much appreciated.