Adprep encountered a Win32 error. Error code: 0x6ba Error message: The RPC server is unavailable.

I managed to resolve this issue myself but I would like to put the knowledge out there
I got the above error when joining a 2012 R2 Standard server to a 2003 Domain.
I found the following article which pointed me in the right direction, but didn't resolve it for me
http://support.microsoft.com/kb/2737560
I verified that my NEtwork Service was properly configured to LogonAsAService
However, when I opened Windows Firewall it told me that IPNAT was using the network, so it couldn't be configured
I removed the Routing and Remote Access COnfiguration from my Domain Controller, and that allowed me to access the RPC server

Hi,
Thank you for your sharing!
Your post is very beneficial to other people who have similar issues.
Best Regards,
Amy

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