SSH tunneling/port forwarding and stateful packet inspection

From: steve (steph19731_at_yahoo.com)
Date: 02/24/04 

Date: 24 Feb 2004 11:03:27 -0800

Most firewalls have stateful packet inspection built in. I am having
difficulty understanding how if a person is running an ssh tunnel from
an internal client to an external server doing port forwarding all via
port 443, than how come stateful packet inspection doesn't catch this
and allow it to pass through?