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NT Domain problems

By joshg ·
We have 5 offices connected to our main office via varying speed T1's. Each office has its own Domain and Exchange server. I have setup two way trusts with all domains. We use the lines for Internet and Exchange. This morning two of the remote domains started experiencing problems logging into Proxy. The log files on the proxy server show no domain controller available to validate logon. So I Ping the DC's of the two domains, that works. I ping the NetBIOS name of the DC's, that works. I verify that I have WINS working and that the DC shows in the cache. When I pull up the Trust Relationship box it says unable to find DC. I can connect to that domain and transfer files and verify backups worked etc. just cant get Inet access working. They can however connect using an account from another domain. I have event ID's of 5719, 537, and 100. I can't find anything conclusive.

Servers are NT4.0 SP6a, Proxy 2.0 SP1, IIS4.0, Exchange 5.5 SP4

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NT Domain problems

by m.s.khalid In reply to NT Domain problems

Please see that you are receiving the ipaddress propely that is when u release and renew it in winipcf or ipconfig the ip address should renew automaically if not check the configuration of the winproxy wheather it is getting external ip properly it think it may solve the problem


khalid

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NT Domain problems

by joshg In reply to NT Domain problems

The addresses are registered correctly in WINS, the user can ping by name and IP.

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NT Domain problems

by m.s.khalid In reply to NT Domain problems

It is the Proxy server which cannot find the DC, so hopefully you did the ping and other tests on the Proxy server.

The number one question is "What changed?" If it worked yesterday, something in the mix changed overnight. You might want to check logs on all DC's.

One of the things which may have changed is someone from another site is visiting your site with a laptop. If they plug into your network, they may become the browse master for their domain on your segment. This would mask theDC as a controller. To avoid this and similar problems, put entries for all DC's in the LMHOSTS file on the Proxy server (and for that matter, on the DC's). The entries should all use the #PRE and #DOM: tags. This should cause validation requests togo to the right place, even if the browse system is messed up.

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NT Domain problems

by joshg In reply to NT Domain problems

From my browser this is an identical answer as Stillatit's. I am giving the credit to the earliest repsonse.

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NT Domain problems

by johnscrooby In reply to NT Domain problems

This is also by no means a solution, but i had a similar problem with trusts not able to find the DC. I worked around it bu adding host information to the host file depicting the DCs in each domain. I can for the life of me remember the cmd line butiwas something like PRE_domainName or something - Check the support base for the exact lines.

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NT Domain problems

by joshg In reply to NT Domain problems

I already have the entries in the LMHOSTS and can ping the DC's fine.

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NT Domain problems

by toliveri In reply to NT Domain problems

We have problems with domain trusts every once in a while. An alternative to breaking and re-creating the trusts is to use the NETDOM command in the NT resource kit. With it you can check trust realtionships as well as the secure channels between your PDC's and BDC's. You can even reset the relationships from a command prompt with no disruptions. Use the NETDOM HELP to get the syntax for the commands. You can also lookup NETDOM in technet or in the knowledge base for more info.

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NT Domain problems

by joshg In reply to NT Domain problems

I am giving you partial points for the utility recommendation.

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NT Domain problems

by joshg In reply to NT Domain problems

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