Hello,
We have 1 Exchange 2013 server sitting in the company LAN.
hostname: exch.domain.com
CNAME is configured as mail.domain.com and internal clients can connect to both
External clients cannot access our OWA via HTTPS. Internally all services are working fine and users are able to access OWA.
When a client connects to
https://mail.domain.com/owa - accessed from an Internet - does not work
https://mail.domain.com/owa - accessed from an LAN - works fine
Diagnostics so far:
Wireshark:
External client connects and sends ClientHello packet but server is not responding with ServerHello. Clients retry several times and then it's timing out. On a client's web browser, it shows "Cannot display the page"
ECP:
All virtual directories have External URL configured with correct URL for example OWA has https://mail.domain.com/owa
"Configure external access domain" option: I cannot add my local exchange as CAS. When I click on save, it goes to blank boxes.
SSL
We use wildcard certificate from Comodo that has been regenerated already but it did not make any difference.
There are no SSL errors when exchange web services are access locally so I would assume that SSL is working fine.
Event logs
no SSL errors
NAT/Network/Firewall
port 443 is open and mapped to the exchange server. Windows firewall is off.
I am sure that there is something obvious that I have been missing.
Any tips would be greatly appreciated.
Thanks
Konrad