There can be multiple reason for Paragon Active Assurance(PAA) - Control Center GUI throwing error as "Gateway Timeout"

This article shares insights and details about the same.

Possible cause -

• Network problem in User's Environment
• Postgresql DB not running properly.
• Apache2 - web service throwing exception.

Steps to be checked and implemented to fix such issues::

• Run service status for all services of PAA to ensure services are running and no errors seen in logs.

sudo systemctl status "netrounds-*" apache2 postgresql openvpn@netrounds
or 
ncc services status

• Ensure no outage or glitch in your internal Network. Work with your internal network team to get this fixed.
• Clear browser cache and load in incognito mode to ensure no browser error.
• Restart Postgresql followed by Apache2 service to clear any PGSQL DB related errors.

sudo systemctl restart postgresql
then,
sudo systemctl restart apache2

• If still issue persist, we need to stop all services and start again.

sudo systemctl stop "netrounds-*" apache2 postgresql openvpn@netrounds
or 
ncc services stop
then,
sudo systemctl start "netrounds-*" apache2 postgresql openvpn@netrounds
or
ncc services start

----------------------------------------------------------------------

• Do run status check for services and then launch the GUI.

sudo systemctl status "netrounds-*" apache2 postgresql openvpn@netrounds
or
ncc services status