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Trouble accessing Network

By rgrowcock ·
I have one computer, mine unfortunately, that keeps leaving the 2000 AD network and I can't figure out why. This has been driving me bonkers for about the last week or so, since I have been working with Cisco's VPN client, and I can't find a solution.

My basic setup is this: 1-Windows 2000 Server, SP3 with Certificate Authority, DHCP, DNS, WINS, and IAS installed, this is my main DC and was upgraded from NT 4.0. I have 2-NT 4.0, SP6a, BDC's as well that seem to be functioning just fine. Replication from the AD DC is happening just fine, so far.

I would have preferred not to use my DC for all of the other things, DHCP, DNS, etc. but I didnt'/don't have a choice at this time.

My Problem: MY computer keeps getting dropped from the network and I am unable to access any other computers on the network. I have tried changing the name of this box about 5 times without any luck. I may get network access for a few minutes, but then in the event viewer, I get an error that a duplicate computer name has been detected. I have also had this error too:Attempt to update HOST Service Principal Names (SPNs) of the computer object in Active Directory failed. The updated values were '<UNAVAILABLE>' and '<UNAVAILABLE>'. The followingerror occurred:
The security context could not be established due to a failure in the requested quality of service (e.g. mutual authentication or delegation).

I have run out of things to try. I have found a few things on the MS KB about duplicate computer names and have tried their work-around but it is still not working. I have also tried reloading the OS, but within a day, same problems. Could there be a problem with the Cisco VPN Client, 3.6, that is causing me all of the headaches?I didn't have any problems until I started trying to setup the VPN.

SOMEONE, PLEASE help! If you need further info, email me at r.growcock@kadasystems.com

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Trouble accessing Network

by Ann777 In reply to Trouble accessing Network

We are using Cisco Systems VPN client for remote users without any problem (Version 3.5.2) --

Is this the first time you've tried version 3.6? Can you uninstall it and see if your computer stays on the network? Can you go back to 3.5.2 or another version?

If I had your computer, I'd backtrack and see where it starts behaving normally again.

If you uninstall CVPN and it still drops from the network, then your best option is to disconnect your computer from the network (change domains so that you are back in a "workgroup") and then go to the server and remove your computer name manually from the network.

Then start your computer, and re-join the domain (you will need domain admin priv to do all of this). Test and see if your computer stays on the network. And then add back the Cisco, but carefully follow the instructions.

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Trouble accessing Network

by rgrowcock In reply to Trouble accessing Network

I've tried uninstalling and reinstalling several times with no effect. I am inclined to believe that my problem is related more to a new DNS server than anything.

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Trouble accessing Network

by george In reply to Trouble accessing Network

Have a look at your DHCP leases and your DNS lookup tables. I have seen where the DHCP server asigns a new IP address to a computer whose lease has expired. The DNS server adds the host with the new IP address, but the old host and IP address are not removed. This causes two entries with the same name, but different IP addresses.

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Trouble accessing Network

by rgrowcock In reply to Trouble accessing Network

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Trouble accessing Network

by d.walker5 In reply to Trouble accessing Network

I have had a similar problem perhaps what worked for me will also work in your situation.

Event Message:
Another machine has sent a name release message to this machine probably because a duplicate name has been detected on the TCP network. The IP address of the node that sent the message is in the data. Use nbtstat -n in a command window to see which name is in the Conflict state.

Source Event Log Event ID Event Type
Nbt System 4320 Error

Explanation:
A few network occurrences can cause this message. A computer on the network may have the same name, or you may be logging on to multiple computers with the same user name. If you are using WINS, you may have inactive or duplicate names in the WINS database. The WINS server sends this error every time it releases a NetBIOS name from the IP address to a new account that is logged on to the same computer. If you are using DHCP, corruption in the DHCP database can cause this error. The error could also be caused by a multihomed computer. Or, a computer may be configured for one name, but an ipconfig -all command returned a different host name.

User Action:
When you use the nbtstat -n command, if the IP address is all zeros, look for any Windows for Workgroups computers on the network with the same name. Windows for Workgroups computers sometimes return all zeros for their IP address with this error. If you log on to multiple computers with the same user name, the user names will register with a <03h> and that will be the name in conflict. If the DHCP database is corrupted, clear the DHCP-related entries in the Registry, delete any .MIB files, and then reinstall DHCP. If a computer was configured for a name but the ipconfig -all command returned a different host name, go to the Registry editor and change the computer name in the TCP/IP parameters section.

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Trouble accessing Network

by rgrowcock In reply to Trouble accessing Network

I think that my problem was two fold, one I had multi-homed the DNS and two, I didn't have my DNS and DHCP setup correctly. I have since removed one NIC, and reworked the settings on both. This hasn't completely eliminated my problems, but it has lessened them. Thanks for the help!

Roger

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Trouble accessing Network

by rgrowcock In reply to Trouble accessing Network

I believe that I am having trouble with a DNS server that I brought online. It was a "hurry up" solution that was needed and I believe that it is now biting me in the butt. This was the first DNS server that I had installed, so I missed some of the basic settings.

But one of my biggest problems is that I keep getting "browser" errors in my Event Viewer. That and "userenv" errors. I have looked on the MS KB website for these specific errors and all I can find out is they relate to DNS configuration errors. The "browser" not as much, but a few things were mentioned. Thanks for the thoughts so far, and I am trying or have tried everything suggested. I REALLY need to get this issue resolved ASAP!! Roger

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Trouble accessing Network

by rgrowcock In reply to Trouble accessing Network

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