Error 64: "The specified network name is no longer available"

Experts,

Hopefully you can assist.  I have two DMZ networks.

192.168.5.9 - windows 2008 r2 file server
192.168.10.8 - workstation windows 7

Ports 139 and 445 are open.

My problem is i am not consistently able to connect to the file server.  Sometimes i'm able to map a network drive and sometimes i am able to browse the share.  It is not consistent.  Please assist.
hangeritAsked:
Who is Participating?
 
Manpreet SIngh KhatraConnect With a Mentor Solutions Architect, Project LeadCommented:
Are you using TMG ?

System error 64 - the specified network name is no longer available
http://social.technet.microsoft.com/Forums/en-US/windowsserver2008r2networking/thread/8878da36-19af-410a-ae48-db1a87af741e

Windows 2008 Server shares – the specified network name is no longer available
http://www.techninja.com.au/2011/05/windows-2008-server-the-specified-network-name-is-no-longer-available/

- Rancy
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Rich WeisslerProfessional Troublemaker^h^h^h^h^hshooterCommented:
Do the machines in the DMZ use DNS registration for name resolution?  (Or at least static entries?)  WINS?  Or are you relying on NetBIOS broadcasts?
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