SQL connection error: The system detected a possible attempt to compromise security

SQL connection error: The system detected a possible attempt to compromise security

 

This error occurs because Kerberos traffic used for authentication is being blocked by the firewall. Here's a KB article about it: http://support.microsoft.com/kb/938457

To solve the problem port 88 has to be open.

How to add an exception to the firewall rules for a specific port:

Go to Start > Control Panel > Windows Firewall > Advanced Settings
Click Inbound Rules. Click New Rule, select Port, and follow the instructions for adding a port 88 exception.
Click Outbound Rules. Click New Rule, select Port, and follow the instructions for adding a port 88 exception.

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