I am building an Exchange environment in a new AD site in my environment. After installing the CAS role on two servers at this site, I am not able to really use them. Going to the ECP virtual directory and logging in just forwards me to the OWA page for my admin account. Likewise doing a get-ecpvirtualvirtualdirectory from the Exchange Shell on any server be-it in my first site or the new site only returns results for the old site. It hangs what seems like indefinitely after returning those results and trying to contact the new CAS servers.
Site A (Old site):
Domain Controllers (many)
2 CAS Servers
6 Mailbox Servers (4 in one DAG - 2 in another DAG)
Site B (New site):
2 Domain Controllers (same subnet as Exchange servers - In AD Sites and Services)
2 CAS Servers
0 Mailbox servers currently (slated for install next week)
AD seems fine. No replication issues, and the subnet is in ADSS as it should be. Would the lack of on-site mailbox servers be the problem here? I'm having my networking team investigate possible problems on their end, but so far that has not been fruitful.