When opening a company file across a network on a machine running a QuickBooks 2008 Database Server, the user was unable to open the file in Multi-User Mode.  The error was H202  – “You are trying to work with a company file that is located on another computer and this copy of QuickBooks cannot reach the server on that computer”.

After confirming read/write access to the network drive, confirming the appropriate firewall exceptions for the executables, deleting the *.ND files in the share, and then rescanning with the QuickBooks Database Server Manager to create new *.ND files, we still could not open the company file.

It turns out the mapped drive script uses the FQDN (eg, \\quickbooksDB.corp.companyname.com\qb$) to access the share.  Once the script mapping was changed to just use the hostname (eg, \\quickbooksDB\qb$), the user could successfully open the company file.