Duplicate Name exist on the network

Posted on 2013-06-21
Last Modified: 2013-06-24
Hi guys!

I have an issue in my network!! I have around 10 windows 7 PCs and around 9 Windows Xp PCs..... since last week we have been getting on ONLY the XP machines (All of them) an error "Duplicate Name exist on the network" this happens every time any Windows XP machine is turn on or connected to our network. I have looked in the network to see if I find a duplicate machine but I didn't find anything!! I don't know what else it might be..... I have a Netgear firewall that is acting as a DHCP.... Do you think the firewall is the issue? Also, this is a network which is under a Domain network. What do yo think? do you have any other ideas on how to troubleshot this?

Question by:hugonieto
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LVL 34

Expert Comment

by:Paul MacDonald
ID: 39266653
It seems likely there is a rogue DHCP server on the network, but it could be a WINS issue.  Do you run WINS?

Author Comment

ID: 39266698
Thanks Paulmacd.... Im sorry but how would I find out if Im running WINS? You mean in the server or in the Windows Xp clients?

LVL 34

Expert Comment

by:Paul MacDonald
ID: 39266735
It's a service - like DNS or DHCP - that is set up by a network administrator.  It's not used much any more, but that doesn't mean it isn't in use on your network.

Have you tried rebooting your Netgear firewall?  That might be worth a try as well.
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Author Comment

ID: 39266752
What I just noticed too is that in the server under the Reverse Lookup Zones I have duplicate PTR records! For example 5 of them have different IP addresses but all 5 have the same host name.... this doesn't look normal does it? do you think this has something to do with the issue?


Author Comment

ID: 39266758

Then I'm not running WINS.... I have not setup something like that here.... I did tried I few reboots on the firewall and I think It does stop for some hours but then it keeps coming back the problem....
LVL 34

Accepted Solution

Paul MacDonald earned 500 total points
ID: 39266825
Yes, you can flush any duplicate records from DNS - both on the forward and reverse look up side - and see if that helps.  

You'll need to reboot the computer(s) or run ipconfig /renew to re-register the computer(s) in DNS.

Author Closing Comment

ID: 39273317
Thanks for the solution Paulmacd!!

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