Cannot demote offsite Domain Controller

We have a client who is downsizing their infrastructure.  Currently they have a Win2003 DC and a Win2012 DC on premise, and a Win2008R2 DC hosted in our datacenter.  I'm trying to demote the DC in our datacenter, but I keep getting an "RPC Server Unavailable" error pointing to the FSMO server (Win2012) when I run dcpromo.  DNS checks out, repadmin /showrepl shows no errors, and repadmin /syncall completes fine.  DFS was working flawless till I disabled it prior to the demotion.  There is a SonicWall TZ210 at both ends, and no changes have been made to them for well over a year.  

I was able to successfully demote the on-premise Win2003 server with no errors.

A little confused as to where else to look to try and find the problem.
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MikeIT ManagerAsked:
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Seth SimmonsConnect With a Mentor Sr. Systems AdministratorCommented:
is the server planned for something else after demoting?
if not, i would just turn it off and cleanup the metadata

Clean Up Server Metadata
https://technet.microsoft.com/en-us/library/cc816907(v=ws.10).aspx

if you are planning to use it, you can forcibly remove AD but you still need to cleanup metadata
doing a force removal will remove AD but not communicate with other domain controllers that it is being demoted hence the need to remove metadata

Forcing the Removal of a Domain Controller
https://technet.microsoft.com/en-us/library/cc731871(v=ws.10).aspx
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MikeIT ManagerAuthor Commented:
Was trying to avoid this, but I just killed the VPN tunnel and did it manually.
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