GUI stopped working suddenly

We cannot access the GUI suddenly. Im able to login the terminal and have checked the fail2ban I did not see anything there but restarted anyway. I also restarted the httpd service but still cannot access the gui. I can ping the system and the phones are all working.

Found it was a certificate error on the computer i was trying to access from. Had to reboot the computer.

A couple of other notes:
Prior to figuring out I needed to reboot my computer I double checked the firewall and fail2ban. and it was not a fail2ban problem. I was not able to ssh to it either. Error logs noted it was a certificate issue. (was able to access it from hyperv to check the fail2ban and logs) I went to another computer on the subnet and was able to access the web interface. There were no banned IP addresses.