We have been transitioning from a SonicWall TZ400 to a TZ370. The basic setup worked OK but I have been unable to enable our on-prem Exchange server SMTP, Activesync, and OWA through the firewall. I have duplicated the TZ400 NAT and Access rules address objects etc. as best as I can tell, but nothing gets through to the server from the WAN. I have disabled all the UTM security apps. There are no hits recorded on either the access rule or the NAT rule when I attempt to send email to the server using Wormly. I've always been able to configure this stuff for the TZ400 and similar firewalls without too much trouble. What am I missing? Is there some new layer in the new OS that needs to be configured?
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