I am able to access email through my owa client sitting on my local network but only by the local ip address. Not sure why, but I can't access the site by name nor can I access the site externally by public IP. I have checked everything. My external DNS records are correct, I can resolve the name to the correct ip address and my firewall is open on port 443 as needed. I'm not an IIS person, but everything is pointing to it as the problem. How does IIS advertise itself? How does the firewall know that https requests need to go to the exchange server?