Domain Issues

Burnsy2023 · 14 Dec 2006 at 11:44

Periodically we get machines 'dropping off' the network. When they try to log on it says that the domain is not avaliable. They have IP addresses and can ping a DC with the global catalog.

Any ideas?

Burnsy

topher · 14 Dec 2006 at 12:10

are the PC's resolving DNS for the DC(s)

so if you ping a server ip does it reply server.yourdomainname

ruffneck · 14 Dec 2006 at 12:17

ping the servers fqdn with a switch of -t leave it for a few mins and make sure your network isn't dropping any packets

Trigger · 14 Dec 2006 at 13:03

We get this every so often also. It says something like 'The domain controller for this domain cannot be found..." It can ping the server fine but will not log on to the network. Removing it and rejoining it to the domain seems to fix it though I have no idea why it does it

Seems to be fairly random as well which machines do it- it isn't the same machine every time so it can't be the switch port.

Andyt_uk · 14 Dec 2006 at 13:11

Trigger said:
We get this every so often also. It says something like 'The domain controller for this domain cannot be found..." It can ping the server fine but will not log on to the network. Removing it and rejoining it to the domain seems to fix it though I have no idea why it does it

Seems to be fairly random as well which machines do it- it isn't the same machine every time so it can't be the switch port.

exactly the same used to happen at the school i used to work at. One every few months or so... re-adding to the domain always sorted the problem though.

Burnsy2023 · 14 Dec 2006 at 13:17

Trigger said:
We get this every so often also. It says something like 'The domain controller for this domain cannot be found..." It can ping the server fine but will not log on to the network. Removing it and rejoining it to the domain seems to fix it though I have no idea why it does it

Seems to be fairly random as well which machines do it- it isn't the same machine every time so it can't be the switch port.

Thats exaclty what's happening here, we have 700+ clients now and its happening to about 10+ a week. I'm trying to find out why.

Burnsy

Curiosityx · 14 Dec 2006 at 15:31

Are you getting the following on the DC?

http://support.microsoft.com/?kbid=810977

Is the time correct on the client machines within 5 minutes of the DC?

Check you havent got a loop in the network, if so the switch will be having a heart attack.

Check you DNS infrastructure if working correctly and the FQDN's are being used to resolve network names.

Check that the WINS domain master browser record is present on your Wins server and points to itself or the machine that is the master browser for the domain. (Record ID 1Bh)

Depending on the OS version use the Windows Server support tools to run the Active Directory diagnostic utilities like DCDiag.exe

Try re-setting the computer account through active directory.

If all else fails LOG ON AS THE LOCAL ADMINISTRATOR remove client from domain and add back onto domain.