troubleshooting Question

Cannot connect to Exchange OWA over Cisco Site to Site VPN

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TRBR asked on
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I am unable to access Exchange OWA from a remote office connected to main office via a Cisco site to site VPN.
Exchange 2013 sever is located at main office on a /24 subnet.
Remote office is on a /24 subnet.
Cisco 860 router each end with IPSEC VPN.
Each office has own AD domain, DNS secondary zones for the alternate office are configured at each other office.
I can successfully ping the FQDN of the Exchange server from the remote office and it resolves to the Exchange server's local IP address on the /24 subnet.
I can connect from the remote office to other devices located at the main office via TLS/SSL no problem.
OWA is working fine from main office connecting locally and every where else via Internet.
When I try to open OWA at the remote office I just get a Page cannot be displayed error.
What should I be looking at to resolve this issue?

Thanks in advance...
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