Vista losing connection to Windows Server 2003 SP2 (DHCP/DNS/DC)

The only Vista workstation configured on a Windows Server 2003 Standard SP2 network (15 XP and this one Vista) loses connection to the server.  After the connection is dropped I am able to ping the gateway and other workstations on the network, but I am not able to ping the server or access the internet (no DNS).  The server is a DC/DNS/DHCP.  The machine seems to work fine after a restart but soon drops the connection.  My work around now is to use a static IP and the external DNS.  This work around does not allow push installs from the server since the Vista is not recognized by the server.  
drestAsked:
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tchamtiehCommented:
There are 2 settings that may affect network tuning - autotuninglevel for Receive Window Auto-Tuning Level which continually determines the optimal receive window size by measuring the bandwidth-delay product and the application retrieve rate, and adjusts the maximum receive window size based on changing network conditions, and rss for Receive-Side Scaling State which allow the network load from a network adapter to be balanced across multiple CPUs.

Its best to disable these 2 settings for resolution. However in most cases, disable autotuninglevel alone will solve most network problems. To disable these network tuning functions, open elevated command prompt with administrator rights, the type the following commands:

netsh interface tcp set global rss=disabled
netsh interface tcp set global autotuninglevel=disabled

Or if you want to combine them into single command, use the following:

netsh interface tcp set global rss=disabled autotuninglevel=disabled

Reboot the computer after the operation completed and see if this solves your issues.

-Thomas
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drestAuthor Commented:
Tchamtieh, tried your fix. did not work. i changed the nic card to dynamic settings, entered your commands..got "Ok" on both.  restarted the workstation...still had same problem...could not contact the dns server.  thanks for the try.
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Darius GhassemCommented:
Disable IPv6 on the Vista client.
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drestAuthor Commented:
dariusq, did that already, did not work.
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Darius GhassemCommented:
What if you statically configure with the local DNS server does still lose connection?
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drestAuthor Commented:
dariusq, i configured the dns server as the local server, but no luck.  i cannot ping the local dns server. from the dns server, i cannot ping the vista machine either.  wierd.
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Darius GhassemCommented:
do an ipconfig /all for me on both client and server then post please.
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drestAuthor Commented:
dariusq, i may not get to that until this evening.  thanks.
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drestAuthor Commented:
Dariusq...here are the ipconfigs...there are 3 sets. 2 from the vista machine (1 with static IP 1 with dynamic).  plus the server.
ipconfig.txt
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Darius GhassemCommented:
When it is static you have IPv6 enabled. Plus you have external DNS servers listed not your internal DNS server 10.0.0.2. Also, if you look the server has this 205.171.2.65 for WINS which is an external address.



   Physical Address. . . . . . . . . : 00-19-D1-81-8D-B8
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::40a1:fcd0:b4c8:ec6c%11(Preferred)
   IPv4 Address. . . . . . . . . . . : 10.0.0.111(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 10.0.0.1
   DNS Servers . . . . . . . . . . . : 205.171.3.65
                                       205.171.2.65
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drestAuthor Commented:
the configuration you are referencing is the one that works, kind of.  When i place the local dns server 10.0.0.2 for the dns server, it fails.  i did notice this however, the dns server was not configured for reverse zone lookup.  would that have any affect with Vista?  i configured reverse zone last night, the Vista machine seemed to be working using the dynamic ip, but it has worked for awhile using dynamic before dropping the connection.  I will probably know more after a bit today.  also, in my troubleshooting, i have disabled the IPv6 with no change, when i downloaded and installed a new driver it reset it back to IPv6.
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Darius GhassemCommented:
Did you change the server to remove the WINS address?
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drestAuthor Commented:
no, but i put that in as one of my torubleshooting efforts.  it wasn't there when this problem appeared.  i will remove it though.
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drestAuthor Commented:
still is failing.  connected for awhile then drops connection to the local dns server...i removed WNS from the client and the role from the server.  next step i plan to try is replace the NIC card on the Vista workstation.  will try that tonight.
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drestAuthor Commented:
I replaced the nic card, updated some drivers that showed up as warnings or errors in the event log and all seems to be working now. this was a very wierd problem and hopefully it is fixed.  thanks for your advice dariusq and tchamtieh, i appreciate the effort!
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tchamtiehCommented:
You're welcome, hope it works out for you.
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Darius GhassemCommented:
You're welcome, I'm glad we could help out.
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