I've read through many related threads, but still confused. The person who set this up is no longer here and I don't have a good handle on port forwarding. We recently had a 10 year old switch fail and it appears to have "fritzed" the settings on our sonicwall. I managed to replace the switch and get the LAN back up and running for all users, but cannot figure out how to get OWA working again. I'm looking for help to get my rules configured correctly. We do not have a security certificate installed (next project) yet. We also were not using dynamic DNS and my handful of users just used our IP address/exchange to hit OWA before this happened. I have a simple network of about 6 users on XP pro workstations that connect to our SBS2003 SP2. This all sits behind a Sonicwall TZ170 and our WAN access is via Actiontec DSL modem from our ISP. Everyone's outlook is working fine to access the exchange server, we just can't get at it via OWA when away from the office.