I've got a new on premise exchange 2013 setup behind a sonicwall tz215. Mail is flowing in and out, and https://mail.domain.com/owa works internally, but not externally. DNS appears to be corrrect as everywhere I can think of to check resolves to the proper external IP. As for the sonicwall, I just ran the wizard once for mail server, and once for web server to open the needed ports. I also disabled external web management and set the default http and ssl ports to 81 and 4430 respectively. I can't for the life of me figure out which I can't access owa externally. I believe it may be hampering the autodiscover record process as well, as autodiscover works internally but not externally. A records are in place and correct with the domain host. A proper cert from godaddy is in place and installed, and as I said, mail flows just fine. I don't think its an IIS issue since I can open the site internally, so I'm really leaning towards the firewall. Any suggestions at all would be greatly, greatly appreciated.