We help IT Professionals succeed at work.

Miscommunication through CISCO routers after migration from Win NT to Win 2003

Menshen
Menshen asked
on
Medium Priority
228 Views
Last Modified: 2010-04-09
Dear Sirs,

After upgrading a domain from Win NT to Win 2003 all the client computers from the subnets are unable to log on to the domain. The clients on the same network segment as the Domain Controller have no problems. All the communication to/from the other segments passes through the following CISCO routers: 7200vxr and 2600.

TCP-IP is traffic is not affected.

Any idea what protocols and TCP/UDP ports should be allowed for proper communication and authentication?

Regards,
Menshen.
Comment
Watch Question

Les MooreSr. Systems Engineer
CERTIFIED EXPERT
Top Expert 2008

Commented:
Win2003 domain is 100% dependent on properly configured DNS and having the clients auto-register themselves in DNS just like they did with WINS. Clients must point to this internal DNS server as primary in order to find the server, and the SRV records must be there.

You might want to setup a WINS server at least temporarily if all of your client workstations are not up to XP..
Keith AlabasterEnterprise Architect
CERTIFIED EXPERT
Top Expert 2008

Commented:
Has anything else changed in your setup?
By tcpip traffic, I assume that you can ping by ip address and name to the domain server(s).
Are any dhcp-set work stations on the associated subnets picking up the correct settings such as IP, mask, gateway, dns servers?

Author

Commented:
Hi,

We solved the problem thanks. DNS and WINS were always available.
We realized we had to change the MTU size on the router... I guess AD authentication in 2003 R2 is more sensitive to changes on the packets.
Les MooreSr. Systems Engineer
CERTIFIED EXPERT
Top Expert 2008

Commented:
What kind of communications lines do you have, and what did you have to change the MTU size to ?

thanks for the update!
Commented:
PAQed with points refunded (450)

GranMod
Community Support Moderator

Not the solution you were looking for? Getting a personalized solution is easy.

Ask the Experts
Access more of Experts Exchange with a free account
Thanks for using Experts Exchange.

Create a free account to continue.

Limited access with a free account allows you to:

  • View three pieces of content (articles, solutions, posts, and videos)
  • Ask the experts questions (counted toward content limit)
  • Customize your dashboard and profile

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.