I have a site-to-site VPN, writeable DC in the main office, Read-only DC in a branch office.
Today the VPN went down, but I couldn't log in to the read-only DC - the error message came up There are no logon servers to process your request.
Since the RODC is a domain controller, there is no local administrator.
How can I ensure that I am always able to log on to the RODC with a known account in an emergency if the writable DC is not available?