Srvr 2008R2 losing access via netbios name/share to ws on same domain.

Hello,  narrowed down an issue with a 2008 r2 virtual vm server that keeps losing access to a nw share off a win7 ws in the same domain.  The IP can continues to be resolved, but out of the blue the share will no longer be accessible, e.g. you can't ping the machine by name or go to the \\wsmachinename\share name that has all the correct share and ntfs permissions.   Starting the server service on the win7 works to resolve or reboot.

I'm trying to come up with a workaround/best way to tackle(quick fix/Band-Aid) and *ALSO* understand why?  

server logged in locally.
ws logged in via domain user.
share on ws permissioned(share and ntfs) for both that server local user name(added to win7 users identically) and domain user.

Feedback, different way to think about this is appreciated.  Thank you.
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FOXActive Directory/Exchange EngineerCommented:
Make sure
1.  there is a dns entry for that workstation in dns
2.  On the server accessing the workstation open up notepad as an administrator and add an entry in your host table pointing to the workstation.  notepad(as administrator) navigate to c:\windows\system32\drivers\etc (show all files) then double click on hosts add the ip and the hostname to that file then save.
3.  You can add mapping from the server to the workstation
     On the server open a command prompt then  example  net use m:\\\\wsmachinename\share /persistent:yes
dee30Author Commented:
Hello, yes I did all those things post logging this call... And after speaking to two different involved vendors about their product configuration requirements/dependancies on a network.   Dns was fine and all things checked out with poets listening etc... So again still don't truly understand why the nerbios and/or stack issue.
FOXActive Directory/Exchange EngineerCommented:
I found this from ChiefIT who responded to someone who had the same issues:


Verified Answer


by:ChiefITPosted on 2012-01-13 at 11:58:00ID: 37430546

Other things to watch out for:

 If you boot a computer and the shares are available for 15 minutes then disappear, this means that windows firewall service starts AFTER netbios broadcasts populate the shares, then after the firewall starts, it blocks the netbios broadcasts, hence hiding things in the browser. So, you have to make an exception to "file and print sharing" on Windows firewall.

 The server service should be started on all
 The workstation service should be started on all
 Netbios over TCP/IP should be enabled on the network adapter properties>>advanced button>>WINS tab
 --You should disable LMHOST lookup while there to prevent LMHOST poisoning.
 File and Print sharing needs to be enabled on the adapter properties:

 For W7 computers on "network and sharing center", "change advanced sharing settings", turn on network discovery, Turn on File and print sharing, turn OFF public folder sharing for the domain group. For the public and home workgroup, turn them all off to prevent insider attacks.

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dee30Author Commented:
awarding but wind up being the IRPStackSize issue I needed to address.  made another change to the win7 machine that the sever was losing access to the share of(share off win7) here  And since then so far so good.
FOXActive Directory/Exchange EngineerCommented:
Nice find!!!
dee30Author Commented:
thanks there were two things.. that link and do addressing the IRPSTACKSIZE reg entries, too.  Thank you.
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