Solved

Event ID 4321 Widows Server 2008 R2

Posted on 2011-03-11
3
1,233 Views
Last Modified: 2012-05-11
We recently migrated to server 2008 R2 from SBS 2003, I noticed that the original network was using a subnet mask of 255.255.0.0 but left it as it was. But now I see a post in EE that may explain the event id 4321 netbt errors that are constant. It suggests that the sM be changed to 255.255.255.0.

Here is the layout of our server configuration:


Server 2008 R2   Domain Controller:          Using Hyper V on above server for two additiona servers:
          Server 2008 R2 / MS Exchange 2010
          Server 2008 R2 / Application Server

This error is only appearing on the Exchange Server.  What is the process to change all of these servers to the new Subnet mask ?   Top down? Bottom Up?  Reboots required? DHCP invoved I would assume.

Thank you in advance

0
Comment
Question by:jlspencer
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 42

Accepted Solution

by:
kevinhsieh earned 500 total points
ID: 35109349
Assuming that all of the IP addresses have the same first 3 octets such as 192.168.1.XXX, you sould have no problem changing all of the subnet masks to 255.255.255.0. It shouldn't matter the order that you do them in. Don't forget to change on the DHCP servers and all statically assigned devices, as well as the router. Update AD sites and services as well. I generally say that reboots should not be necessary, but they could be requested. It was Patch Tuesday this week, so if you didn't patch already this week now would be a good time. ;-)
0
 

Author Comment

by:jlspencer
ID: 35110014
So the order does not matter? I can do DHCP then the statics on the three servers?  What about the clients will they renew with out issue?  FYI all on same 3 octets, for the life of mme I do not know why the admin at set up the SBS 2003 opened it up to such a wide network.
0
 
LVL 42

Expert Comment

by:kevinhsieh
ID: 35111441
Order should not matter, because the mask determines what the client thinks is part of the local network and what is remote. Everything that you actually talk to that you think is local will remain local, even with the new mask, so it's not a problem. I don't think that the clients will have any issue. I don't know if they need to go all to the to their lease expiring, or if they will get it at the next renewal period.
0

Featured Post

On Demand Webinar - Networking for the Cloud Era

This webinar discusses:
-Common barriers companies experience when moving to the cloud
-How SD-WAN changes the way we look at networks
-Best practices customers should employ moving forward with cloud migration
-What happens behind the scenes of SteelConnect’s one-click button

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Configuring network clients can be a chore, especially if there are a large number of them or a lot of itinerant users.  DHCP dynamically manages this process, much to the relief of users and administrators alike!
It’s been over a month into 2017, and there is already a sophisticated Gmail phishing email making it rounds. New techniques and tactics, have given hackers a way to authentically impersonate your contacts.How it Works The attack works by targeti…
Windows 8 comes with a dramatically different user interface known as Metro. Notably missing from the new interface is a Start button and Start Menu. Many users do not like it, much preferring the interface of earlier versions — Windows 7, Windows X…
With the advent of Windows 10, Microsoft is pushing a Get Windows 10 icon into the notification area (system tray) of qualifying computers. There are many reasons for wanting to remove this icon. This two-part Experts Exchange video Micro Tutorial s…

737 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question