In the Management Console tree, select the node of the relevant Security Server.
Select the Server protection node.
In the workspace, select the Protection for the Transport Hub role tab.
In the Attachment filtering drop-down section, click the Add rule button.
Click the Save button.
The rule will be added to the list in the left part of the workspace. The default name is New rule. The settings and conditions for triggering the rule will be available for configuration.