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Hardware upgraded Windows 2003 DC now client machines slow.

Posted on 2006-05-29
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Last Modified: 2010-03-18
Replaced Win2003 DC (incl DNS) with another box for hardware reasons.  On new box installed DHCP and DNS then ran Dcpromo.  All worked fine so manually transferred FSMO roles and selected GC (removed GC from old server).  Checked new DNS was primary and transferred DHCP from old server changing scope to reflect new DNS server.  Left for 24hrs to replicate between old and new DC then took old server offline.
Run ipconfig/ release and renew on all clients to renew lease.  Now all clients are working fine except 7 out of 80.  These 7 are extremely slow to login and when browsing the network the machine locks up.  These clients are pointing to the new DNS server but obviously still looking for the old first.  This was proved by bringing the old DC server back online but disabling DHCP and Netlogon services.  Have deleted DNS entries and run ipconfig/ flush and registerdns on these clients and both DNS zones are updated on new DNS server.  I'm fairly certain it must be an DNS issue.  Do not wish to demote old DC until everything hunky dory.
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Question by:emerym
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by:Jay_Jay70
ID: 16786605
Hi emerym,

check your DHCP settings, make sure they arent including a reference to your old DC for DNS, also make your DNS zones AD integrated
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Author Comment

by:emerym
ID: 16786632
Cheers Jay, but if DHCP settings had ref to old DC, problem would be for all clients.  Also when using dcpromo in an established DNS integrated zone domain the zone settings are automatically copied to the new DNS server.
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by:Jay_Jay70
ID: 16786652
i agree with your DHCP comment to a point, often machines behave differently and they can be a prick to troubleshoot.....you didnt mention integrated zones so i thought i should check! :)

do your nslookups pass for the server from the client machines
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Author Comment

by:emerym
ID: 16786694
yes they do and I can ping all servers by hostname
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by:Jay_Jay70
ID: 16786751
no old static wins entries lying around?
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by:emerym
ID: 16786769
Unfortunately not.
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by:Lazarus
ID: 16786776
You might want check if they are using offline file caching, if so flush that as well.
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Author Comment

by:emerym
ID: 16786811
None of the clients in question have it enabled, good question though.
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by:Jay_Jay70
ID: 16786815
what do your event logs report?
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Author Comment

by:emerym
ID: 16786821
nothing out of the ordinary except application hung entries due to not locating their home drives.
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Author Comment

by:emerym
ID: 16787011
Think I have found the problem.  Clients H:\ drive mapping points to new server and desktop 'My Documents' folder has UNC path to old server!!
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by:Jay_Jay70
ID: 16787088
ha! that could do it

well done
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