I'm having a peculiar problem on one of my servers at the moment, which seems to be related to authentication in some way, but I have no idea how to find the root of the problem.

I have a folder on the server D:\Somefolder\Logs.

If I am connected to the server via an RDP terminal, so essentially "local", I cannot access that folder - I get an access denied.

If I am connecting from my machine to it using the share \server\d$\Somefolder\Logs, I can access it.

I'm logging in to both machines as the same user. Permissions on the folder seem quite simple, CREATOR OWNER, SYSTEM and Administrators. I am a Domain Admin, and they are in the local "Administrators" group.

It is also affecting things like access to SQL Server, so I don't think it's a simple folder-permissions thing. For example, I cannot connect SQL Management Studio to all the local SQL instances using a domain account, but I can if I connect remotely to it.