RPC error when configuring Exchange 2013 servers in 2nd site

Hello. I'm running into an error when trying to configure any of my Exchange 2013 servers in my 2nd AD site. To get into the loop of what my server structure looks like, please check below:
Site 1 servers:
DC1 - Domain Controller
DC2 - Domain Controller
CAS1 - CAS server
CAS2 - CAS server
MBX1 - Mailbox server
MBX2 - Mailbox server
MATHAFTMG - TMG server
Site 2 servers:
CCCDC1 - Domain Controller
CCCDC2 - Domain Controller
CCCCAS1 - CAS server
CCCCAS2 - CAS server
CCCMBX1 - MBX server
CCCMBX2 - MBX server
CCCTMG - TMG server
Currently I have a site-to-site vpn connection between site 1 and site 2 TMG servers via Internet connection; I can access the servers of the other site perfectly (whether I am in Site 1 or Site 2).
All user mailboxes are currently in Site 1 MBX servers; when users are in Site 2, they connect to the CAS servers in Site 1 to access their mailboxes.
Many users will stay permanently in Site 2, so it makes sense to have Exchange servers in Site 2 to provide faster access to mailboxes. I created the Site 2 domain controllers, and made sure AD replication is working; and it is. I then added the MBX servers
and CAS servers in Site 2 in this order: CCCMBX1, then CCCCAS1, then CCCMBX2, then CCCCAS2.
All Exchange servers in Site 2 installed beautifully. But then I tried to access the servers via ECP to proceed with the configuration. In ECP, I click on the server link, and all Exchange servers in both sites appear. If I try to configure the virtual directories
of Site 1 CAS servers, no problem. But when I try to configure virtual directories of Site 2 CAS servers, I get this error message:
The task wasn't able to connect to IIS on the server 'CCCCAS1.domain.com'. Make sure that the server exists and can be reached from this computer: The RPC server is unavailable.
The virtual directories issue is just an example. Same thing happens if I try to configure Outlook Anywhere for Site 2 CAS servers.
Users connect to Site 1 CAS servers via mail.domain.com. I have the A record mail.domain.com pointing to the IP address of CAS1 server, and another A record mail.domain.com pointing to the IP address of CAS2 server. Not the best load balancing going on here,
but it works great with Exchange 2013.
From mail.domain.com I can access OWA and ECP internally and externally; no problems there. From ECP I can access and configure any Site 1 Exchange 2013 servers.
The only problem is when I access ECP to configure the Site 2 Exchange 2013 servers, I get the same error message:
The task wasn't able to connect to IIS on the server '<server name>.domain.com'. Make sure that the server exists and can be reached from this computer: The RPC server is unavailable.
Even if I try to access a Site 2 Exchange 2013 server via https://localhost/ecp to configure it, it get the same error message.
I updated all Exchange 2013 servers in both sites to CU2 v2 and rebooted the servers in the proper order; problem still there.
Any clue what might the problem be?
Thank you!

Hello. I'm running into an error when trying to configure any of my Exchange 2013 servers in my 2nd AD site. To get into the loop of what my server structure looks like, please check below:
Site 1 servers:
DC1 - Domain Controller
DC2 - Domain Controller
CAS1 - CAS server
CAS2 - CAS server
MBX1 - Mailbox server
MBX2 - Mailbox server
MATHAFTMG - TMG server
Site 2 servers:
CCCDC1 - Domain Controller
CCCDC2 - Domain Controller
CCCCAS1 - CAS server
CCCCAS2 - CAS server
CCCMBX1 - MBX server
CCCMBX2 - MBX server
CCCTMG - TMG server
Currently I have a site-to-site vpn connection between site 1 and site 2 TMG servers via Internet connection; I can access the servers of the other site perfectly (whether I am in Site 1 or Site 2).
All user mailboxes are currently in Site 1 MBX servers; when users are in Site 2, they connect to the CAS servers in Site 1 to access their mailboxes.
Many users will stay permanently in Site 2, so it makes sense to have Exchange servers in Site 2 to provide faster access to mailboxes. I created the Site 2 domain controllers, and made sure AD replication is working; and it is. I then added the MBX servers
and CAS servers in Site 2 in this order: CCCMBX1, then CCCCAS1, then CCCMBX2, then CCCCAS2.
All Exchange servers in Site 2 installed beautifully. But then I tried to access the servers via ECP to proceed with the configuration. In ECP, I click on the server link, and all Exchange servers in both sites appear. If I try to configure the virtual directories
of Site 1 CAS servers, no problem. But when I try to configure virtual directories of Site 2 CAS servers, I get this error message:
The task wasn't able to connect to IIS on the server 'CCCCAS1.domain.com'. Make sure that the server exists and can be reached from this computer: The RPC server is unavailable.
The virtual directories issue is just an example. Same thing happens if I try to configure Outlook Anywhere for Site 2 CAS servers.
Users connect to Site 1 CAS servers via mail.domain.com. I have the A record mail.domain.com pointing to the IP address of CAS1 server, and another A record mail.domain.com pointing to the IP address of CAS2 server. Not the best load balancing going on here,
but it works great with Exchange 2013.
From mail.domain.com I can access OWA and ECP internally and externally; no problems there. From ECP I can access and configure any Site 1 Exchange 2013 servers.
The only problem is when I access ECP to configure the Site 2 Exchange 2013 servers, I get the same error message:
The task wasn't able to connect to IIS on the server '<server name>.domain.com'. Make sure that the server exists and can be reached from this computer: The RPC server is unavailable.
Even if I try to access a Site 2 Exchange 2013 server via https://localhost/ecp to configure it, it get the same error message.
I updated all Exchange 2013 servers in both sites to CU2 v2 and rebooted the servers in the proper order; problem still there.
Any clue what might the problem be?
Thank you!

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