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Event ID 2012 - The server has encountered a network error 

In general, Event ID 2012  indicated there is a connectivity or name resolution problems.

Possible Causes and Solution:

1. Upgrade the NIC drive.

2. Re-configure the NIC settings, for example, re-set the NIC speed to match the switch/hub/router speed.

3. Determine the optimal MTU

4. Try another NIC.

5. Check the DNS and WINS settings.

6. Make sure the DC is not running on a multihomed computer.

7. Install a WINS server if you have WAN or VPN.

8. If you don’t use IPX, remove it from the computer.

8. If you do need IPX, check for the IPX protocol and the Btrieve applications on the server. For additional information, see the following article or articles in the Microsoft Knowledge Base: 195641 (http://support.microsoft.com/kb/195641/EN-US/) Btrieve, IPX, and Event ID 2012

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Event ID Troubleshooting

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www.chicagotech.net/wineventid.htm

connection issues after 2003 sp1

A: It could be the MTU issue. (Note: check this page for the details ... MTU size my router(s) can use is 1372. setting the MTU value for PPP and VPN cured ...
www.chicagotech.net/Q&A/2003sp1b.htm

How to change mtu

This step-by-step article describes how to modify the default MTU size ... To change the MTU Settings, select the the following options how to accordingly. ...
www.howtonetworking.com/VPN/mtu1.htm -
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How to determine the optimal MTU

In a case you may need to modify the MTU size and wonder how to determine the optimal MTU for your system. You can use ping command to do so, for example, ...
www.howtonetworking.com/VPN/mtu4.htm
 

Name resolution on VPN

Name resolution Issue in a VPN client Name Resolution and Connectivity Issues on W2K Domain Controller with RRAS and DNS Installed ...
www.chicagotech.net/nameresolutionpnvpn.htm

Troubleshooting computer browsing issues

Master Browsing issue on Multihomed DC One computer screw up the network The browser was unable to retrieve a list of servers from the browser master ...
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