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logon screen not coming up

By NetWill ·
Brief explanation of our network:

10 sites linked via FR 56K/128K
Each site has a switches, NT4.0 BDC and 10-25 PCs.
Main office has switches, NT4.0 PDC, BDC, Exchange5.5 server and 20 PCs.

Problem:
At several remote sites(not main office),the users complained that when they start the computer "network logon" screen doesn't come up. If they restart the computer couple of times, "Network Logon" screen will appear.
(Note: the problem is most noticible when most of people are login on at 8 AM)
This problem appears on several PCs but not always the same ones. This problem happens at various sites.

Suspect cause of problem:
1- NT BDC server (PII200, 128MB) is slow in processing logon requests.
2- User logging on trigges synchronization among BDC and PDC. Thus causing NT BDC stop taking more logons.
3- DHCP (each site has it own range of IP addresses) is slow in assign IP addresses.
4- WINS sychronization is slow.

I have ajusted #2 and #4 but no changes.

Question:
Any of you encounter this problem?
What did you do to correc the problem?

Appreciate the help!

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logon screen not coming up

by McKayTech In reply to logon screen not coming u ...

It would be helpful to know what OS you're running on the desktop. I've seen this problem with NT Workstation where the workstation was bypassing the local BDC and trying to authenticate against a distant BDC.

I think I would first look at the environment variables (type SET at the command prompt) and see what the LOGON server is. If it's not the local BDC, you might want to explore the utility Microsoft has issued for setting the preferred Domain Controller (setprfdc is the filename, I think).

The other scenario in which we've seen this sort of thing is with 3Com NIC cards and Spanning Tree Protocol on our Cisco switches.
There are several workarounds, including disabling auto-negotiation and setting an explicit speed and mode, or adjusting the STP parameters on the switch.

regards!

paul

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logon screen not coming up

by NetWill In reply to logon screen not coming u ...

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logon screen not coming up

by savatovic In reply to logon screen not coming u ...

Other things worth checking:

we had problems with McAfee Virus scan. DAT file froze the PC (specialy Win 95).

Check disk with Scandisk on Win95/98. Remove *.tmp files.

Clear Internet Explorer cache.

Defrag hard drive.

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logon screen not coming up

by NetWill In reply to logon screen not coming u ...

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logon screen not coming up

by tbradley In reply to logon screen not coming u ...

The biggest problem you have is bandwith. You have 10 sites, with 10-25 users each all trying to pull information from the Primary via a very narrow pipe.

I'm not that familiar with NT, but a no-no in Novell is never ( when you can avoid it ) isto have users pull their user data from across a wan link. You need to reconfigure your BDC's to provide user information, vice the primary server. Perhaps this can be done on the client side ( I know it can be done in Novell ). The primary should only be used at the main office, and to update the BDC's on user information, in case their site's server goes down.

Again, simply put, every user login creates traffic across the wan link. As you say, this is a 56K/128K which is very marginal for the 200+ users you say you have. Evidence to this fact you say the problem is at it's worst at the usual login time... ie 8am when everyone shows up at work.

Again, I'm not familiar with NT, but you need to divorce your remote users from being dependent on login data from the primary.

hope this helps....

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logon screen not coming up

by NetWill In reply to logon screen not coming u ...

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logon screen not coming up

by rappenp In reply to logon screen not coming u ...

You said you adjusted #2 some I'm thinking you have setup replication, this wouldn't work very well with the defaults, (you don't have the pipe) Anyway have you looked in the EVENT LOG to see if the replication has been failing?? (I bet it has) If it's been failing you must tune it until it get's going.

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logon screen not coming up

by NetWill In reply to logon screen not coming u ...

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logon screen not coming up

by Smurfman In reply to logon screen not coming u ...

Ok, I guess I would look at a few things. First if these are in fact NT workstations that your clients are using, then find out who is authenticating thier logon's (if there is more than one at all). Do this by choosing Start -> Programs -> Admin Tools -> Win NT Diagnostics. Click on the Network tab and look for the name of the PC that authenticated each user.

Note who it is that is authenticating everyone, ie if everyone is being authenticated only by your PDC then this could be causing the problem with Slow Network Connections. Use the Admin Tool, server manager to see if your BDC's are in fact registering themselves as BDC's in Server MGR. If they are not, then there is a sync. problem, and you need to re-sync the secure channel between each of them. Use the tool provided by Microsoft NETDOM.EXE using this can reset the secure connections between a specific BDC and the PDC. This can help if the replication is also not working properly, ie, missing logon scripts and such.

Look into the Event log as was already mentioned, and see if the NETLOGON service is completing successfully. Do this on all the BDC's and the PDC. If it is not present, then make sure the service is not disabled in the Control Panal -> Services.

Well, good luck, hope this can be of some help.

Smurfman

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logon screen not coming up

by NetWill In reply to logon screen not coming u ...

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