Clients use external domain name for the ActiveSync server address.
A NAT Policy is used to translate the external name/IP to the internal IP. (loopback)
ActiveSync works great on 3G/4G however when clients enter the WLAN, internet & dns work but not ActiveSync.
A packet capture reveals that the Exchange server is sending RST packets to the client.
I have run this setup many places with no issues, not sure where to start.
Thanks,
John