Windows 7 Pro randomly loses Mapped drive connection

Hello.

We have a mixed network.

Server 2008 R2 DC
Xp Pro and a bunch of new Win 7 Pros.

Stange thing is on most not all win 7 pro machines they randomly lose there connection to the server the mapped drives get the red X and then it comes back.. this is causing all kinds of issues when trying to save files ect.

any ideas. I have updated all system and drivers and it still happens. I have been troubleshooting this for a few awhile now happened on 1 machine and yesterday started happening on all win 7 machines particularly when trying to save an autocad 2007 drawing back to the server.


thanks Experts

Sincerely
Thought I was an expert.
jjanknegtAsked:
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IanThCommented:
I have seen that on ee several times as yet microsoft have not to my mind come up with a fix
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Run5kCommented:
We see this on a semi-regular basis.  Test the following update on one of the Windows 7 machines:

http://www.experts-exchange.com/Q_25075822.html
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Darius GhassemCommented:
Here is a Fixit from MS that should fix issue,

http://support.microsoft.com/kb/297684
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jjanknegtAuthor Commented:
I saw this during my troubleshooting does it pertain to server 2008 R2 as well.
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Darius GhassemCommented:
Yes
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jjanknegtAuthor Commented:
Okay done - just have to wait for a restart window and hope for the best. this has been driving me nuts the past few days.

Rebuild DNS, re-configured and configured network cards.  ect..

I also did what run5k referred me to and set the Send LM & NTLM responses in the local security policies.

Thanks guys.
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Run5kCommented:
Glad to help.  Those two fixes will typically eliminate this problem in the vast majority of instances.
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jjanknegtAuthor Commented:
Okay its a mess right now - just waiting to restart server.
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jjanknegtAuthor Commented:
okay did the restart and i guess its good won't really know till users start working again

i do get this new error on one of the workstations

"An error has occurred
ms networks: the local device name is already in use.

this connection has not been restored"

wait a few then it back..... very annoying for user any suggestions???
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Run5kCommented:
I have seen that message when there is some type of conflict regarding the drive mapping.  It's only happening on one workstation?  Check to see it that machine (or the specific profile) has any manual drive mapping in place.
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jjanknegtAuthor Commented:
its all manual.. what do you suggest GP?
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Run5kCommented:
It's strictly a matter of personal preference.  Many domains are still rather "old school" and have them mapped via logon script residing on the domain controller, utilizing a simple set of net use commands to first delete the appropriate drive letters and then map them appropriately.
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jjanknegtAuthor Commented:
Thats what i usual do, havnt had much luck with GP - but i am getting better.
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Darius GhassemCommented:
GPO Preferences is a great tool to use when deploying network share drives
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jjanknegtAuthor Commented:
well the fixes did not work all win 7 machines are dropping connection on off.  worse then ever

this is the error

"An error has occurred
ms networks: the local device name is already in use.

this connection has not been restored"
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Darius GhassemCommented:
http://social.technet.microsoft.com/Forums/en/w7itpronetworking/thread/cd62bd6b-2087-485c-828a-a65675c58e1b

You can setup in your batch file net use * /delete

Or use GPO to deploy network drives
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jjanknegtAuthor Commented:
these are windows 7 pro machines connected to a domain.

disabled trend for now.  see that helps. but a few users don't have trendmicro and they are having the issues as well
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Darius GhassemCommented:
So, you are deploying network drives through batch file? Post file.
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jjanknegtAuthor Commented:
they are manually added. when a new machine or user starts
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jjanknegtAuthor Commented:
Wonder if i assign and IP instead of DHCP that would work??
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Darius GhassemCommented:
Is the network drive location a DHCP system?
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jjanknegtAuthor Commented:
yes it is a DHCP.  i set static and seems better.  little drop but connects faster...  i think.
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jjanknegtAuthor Commented:
Okay every one.

I figured it out. !!!!

I have a new sysadmin doing some optimization on a few of my servers. Monday night he disabled one of the NICs on the server as well as ipv6 - the following day is when all the problems started, So after 20+ hours of troubleshooting.  applying several different patches. Frustrations, upset client. I decided to review his work. and see what he did that many have caused the problem. So I re-enabled NIC2 and IPv6 everything started working..   Strange not even sure why or how that would have caused the issue Xp users didn't even know it was happening.

anyways thanks for all your help guys.  

Jeff
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Run5kCommented:
Glad to hear that you discovered the root cause!  I'm sure that your new co-worker had the best of intentions.

A few months ago our team had a rare day when our two best Windows technicians were both taking the day off.  One of our young protégées seized the opportunity to be proactive and optimize the file server that was dedicated to the IT team.  Part of that streamlining process included scrutinizing our security settings, so she thought that the file server would be ideally locked-down if she cleaned up the local Users group by removing NT Authority\Authenticated Users along with NT Authority\Interactive.  The next day when our team was at full strength again, it took a decent portion of the day before we discovered why our non-admin accounts couldn't access the server and an RDP session would simply sit at a black screen!

Best of luck in the future.
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jjanknegtAuthor Commented:
I figured the issue out,
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