Question

User does not have rsop data at remote location?

Asked by: menreeq

We are running into a problem with a remote location that we are joining to a domain that is connected via a Sonicwall VPN. We have another site connected that does not have this issue. When adding to the domain we noticed that it took a very long time and logging in also takes a long time. It seems as though computer GPO is applying fine but user gpo is not. DNS is configured correctly but when running rsop we get 'Invalid Namespace' and when running GPResult we get user does not have RSOP data (this is for any user). When trying to browse to the \\domainname.local we get a username/password prompt. This is happening for all workstations at this site, yet the other site yields perfect RSOP and Gpresult.

These computers were previously part of another domain. Any help would be greatly appreciated. Thanks.

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Asked On
2008-11-08 at 00:45:58ID23887458
Tags

Microsoft

,

Windows

,

Xp Sp3

,

Group Policy DNS

Topics

Active Directory

,

Virtual Private Networking (VPN)

,

Windows Server 2008

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Answers

 

by: RobWillPosted on 2008-11-10 at 15:42:43ID: 22926810

Make sure the clients, which are likely configured using DHCP from the Sonicwall, receive only your Internal DNS server's IP for their network adapter's DNS configuration. Adding the ISP, even as an alternate/secondary DNS server can cause this problem. If possible, also add the domain suffix to the client machines. This can be done manually (see link) or through DHCP with many routers. With a Window server as a DHCP server it is done as scope option #15.
http://www.lan-2-wan.com/Added%20Images/Blog/DNS.jpg

 

by: menreeqPosted on 2008-11-10 at 16:45:32ID: 22927088

It took a while but Ive identified what is going on.  Its a pretty complex issue:

Problem 1:  The Sonicwall VPN is fragmenting the Kerberos UDP packets so the workstation is not able to authenticate successfully with the DC

FIX:  Force Kerberos to only use TCP.  This is a simple registry change on the workstation:  http://support.microsoft.com/kb/244474

Problem 2:  Workstations use ICMP (ping) packets to check if a DC is alive before it start communicating w/ it.  With the initial ping it also includes a bit more data to test the quality of the connection.  This places the size of the ICMP packet over a threshold and makes the Sonicwall think that it is a ping of death resulting in the packet being dropped.

FIX:  One registry change that is applied to the HKLM and one that is applied to the HKCU  the problem is that this last one has to be applied for every user and that user has to be a local admin while the registry change is applied  definitely doable because we already have everyones credentials but not ideal.  
http://www.experts-exchange.com/Networking/Q_21304901.html

 

by: menreeqPosted on 2008-11-10 at 16:46:35ID: 22927095

What I posted above are work-arounds, I was fortunately able to find the root cause - it was the MTU setting on the remote site Sonicwall.  Changed it to 1500 to 1404 - that made everything work.

 

by: RobWillPosted on 2008-11-10 at 17:26:17ID: 22927265

Glad to hear you were able to "resolve" menreeq, and thank you for posting your findings.
Cheers !
--Rob

20120131-EE-VQP-002

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