I don't think it is a case of changing policy, but seeing all results and not just those blocked.
Virtually all outbound connections will have an associated inbound connection, so to make sense of this, there should be an outbound connection from svchost.exe at very close to the same time.
By looking at the associated outbound connection can you get an idea of what is going on. The svchost.exe file has legit reasons for making an outbound connection and the more most common is connecting to windows update.
I don't use comodo, so I can't help with its settings.