Some time ago, I was talking to a user on the phone, while remotely controlling their computer. I needed to connect to a folder on a network share as my admin account, rather than that of the logged-in user, but kept running into the following error:
Error 1312: A specified logon session does not exist.
It did not matter whether I was using the wizard to map to the share, or the command line; I kept getting the error message. After trying a number of combinations, I found a workaround. By first attempting to map the folder in which the folder was located (at which point I got the error message), I was next able to map the desired folder. I would also note that I was only able to make this work from the command line.
The commands look like this:
net use \\domain\folder /user:domain\domainadmin
net use \\domain\folder\actual folder /user:domain\domainadmin