Does anyone know what ports need to be configured to enable ArcGIS Monitor to connect and monitor ArcGIS Servers behind a firewall? 6443 for sure but what other OS level ports will need be enabled? Maybe port 22?
The ArcGIS Servers are Linux servers.
Yes, make sure port 6443 is open for monitoring ArcGIS servers. Port 22 is the default SSH port on Linux. Please check your /etc/ssh/sshd_config that port 22 is being used, then that port will need to be open to connect to your server via SSH.