While using the profiler you may be prompted by your firewall to allow the profiler to continue working.

The way the profiler works is by listening on a TCP sockets for events from Linq to Sql, in order to do that, it needs to listen to a socket, an action that sometimes trigger an alert in firewalls.

Denying permission to start listening on a socket will disable the profiler's ability to do live profiling. It is strongly recommended that you would allow it.

The profiler also makes a check for updated version. And in the case of a profiler error, the profiler will ask you if it is allowed to submit the error details so it can be fixed.