We are trying to add a site office to the corporate domain but when we try to dcpromo the machine we get the following error message:
Active Directory Installation Wizard
The wizard cannot gain access to the list of domains in the forest. The error is:
The semaphore timeout period has expired.
The site office is connected through a firewall vpn (Sonicwall) over a 2MB connection.
Additional Info:
Server is brand new vanilla install of Windows 2003 Server R2
Pings by IP address are working with times of around 150ms.
DNS seems to be working as from new server we can ping FQDN's on the new domain. (have set the primary DNS to be one of the DC's on the new server) Also have tried NSLOOKUP tool and am getting correct addresses.
Any help would be appreciated.
Best regards
G
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Finally have resolved the issue:
Issue was due to MTU Maximum Transmission Unit . On a 2003 server its set to 1500 bytes, but for the vpn tunnel that is too big.
I did this command from the new server a few times to find the optimal setting:
Ping [root domain IP] f l [size]
(See http://www.howtonetworking
Once that was found I used this value and updated the registry:
http://www.pctools.com/gui
http://support.microsoft.c
(Although I dont think the Microsoft one helped)
Then rebooted and tried the dcpromo again.. Hey presto it worked straight away&
Thanks for the help and info.
Business Accounts
Answer for Membership
by: SteveH_UKPosted on 2008-01-21 at 14:16:26ID: 20710216
Make sure the clock on the new server is in sync with the domain. See http://blogs.bdnet.co.uk/s
Also, make sure that you can send all traffic through the VPN.
Set both DNS entries on the new server to servers in the domain and make sure you attempt to join using a Domain Admin account. Make sure that all the DCs in the office are accessible.
Also consider viewing AD Sites & Services and make sure the Subnets are configured.
Check the event logs for further information.
Let me know how it goes.