_:n64694ce9f6b6494eb7e83ce3681be347xb1
<http://schema.org/text>
"Greetings all and thanks in advance. This is driving me a little crazy.  So I've setup exchange activesync, and I'm trying to test it with my user account.  (tested it with others too, still doesn't work).When I connect with Activesync and TLS, port 443 it pops up the certificate (but shows the issuer is our gateway, sonicwall box).  I figured this could be an HTTPS issue, resolving improperly on our external IP. So I try port 80, which doesn't authenticate on the server either.. the error is \"You don't have permission to sync with this server\" So i try IMAP, POP3, both give a \"couldn't open connection to server\"So naturally I believe there's a firewall rule set improperly, but as I check into my sonicwall, I have one NAT set from the public IP to the private, allowing traffic for POP IMAP and Activesync, then on the firewall rules I have each of these ports open from WAN to LAN pointing towards the Public IP.So I feel there's something I'm missing,  on Activesync, the Security Certificate Issuer is the Sonicwall Box and NOT the Mail Server,  I think that's a big tell right there, but no matter what I put in, it seems like it isn't bypassing it, even with the NAT translation.  I'm sure I'm just frustrated and not seeing the simple solution..  Any ideas where I might find the issue? "
<https://community.spiceworks.com/topic/2080216-exchange-sonicwall-activesync-could-not-open-connection-to-server>