Plesk Control Panel is Not Available from Inside an Intranet

Plesk Servers > Plesk Control Panel
Plesk Control Panel is Not Available from Inside an Intranet
Issue

When you try to log into your Control Panel from within your office or work network you get one of the following errors:
  • Proxy Server Error
  • Access Denied Error
  • Microsoft ISA Server Error
Cause
Traffic is not being allowed on port 8443. This is a port that Plesk Control Panel services runs on.

Resolution
A network administrator will need to allow web browsing on port 8443. You will need to contact them and request that the firewall exceptions are modified to allow port 8443.

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