2008 r2 sql express can't connect to backup exec 12.5
I have an old backup exec server (12.5 rev 2213 SP4), i'm trying to backup a db we have on a sql express 2008 r2 server and when trying to set the job up when in the resource selection sometimes the sql server appears on the server in question and other times it doesn't.
When i try to select the sql server i get thrown the following error:
An error was encountered while attempting to browse the contents of
A network connection to the server could not be established
The agent is running on the server (i can take a system state backup from the server w/out issue) and i can backup successfully using the same conf on another sql server express 2008 r2 server.
I've googled around and not found a great deal of info (or much which is applicable to this)
Can someone point me in the right direction on this?
Thanks in advance