Currently migrating from Exchange 2010 to 2013 and are in coexistence. I moved my mailbox from 2010 to 2013 and email within Outlook 2013 on Windows 10 is working without any problems. However my iPhone and Windows 10 mobile won't sync any email, they connect but no email will sync. The setup is as follows: Exchange 2013 2 node DAG servers. 2 CAS servers setup in a Windows NLB. External certificate for email.domain.com installed on both CAS servers. Virtual Directories setup on both CAS servers for ActiveSync with external name using the email.domain.com name and the internal of mail.domain.com. Split DNS setup. Firewall rule created to allow anything to connect to the CAS NLB IP address, via HTTPS only, which has a NAT on for external connection and public DNS setup to point to the external NAT address. On the iPhone if I add an Exchange email account and configure the settings manually, enter the Server address as email.domain.com, enter the Domain and the Username, it verifies the account and puts ticks next to everything. Then when you open the Mail app nothing syncs and I get the error message Cannot Get Mail The connection to the server failed. What could I be doing wrong???
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