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When I click on the SYSTEM tab, I get an Access Denied Error

ISSUE:

When you browse to your plesk control panel or you click on the SYSTEM tab inside of HSPC, you get an access denied error.

CAUSE:

This happens when your network administrator is blocking HTTPS over port 8443.

RESOLUTION

In order to resolve this issue, you will need to contact your network administrator and have them enable HTTPS traffic over port 8443.