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Barracuda NextGen Firewall X

Concurrent NAT connections to Microsoft Windows 2000 Server are not possible

  • Type: Knowledgebase
  • Date changed: one year ago

Solution #00005082


This solution replies to:
- NG Firewall firmware versions 4.2.x, 5.0.x, 5.2.x
- netfence firmware versions 4.2.x


When two client computers try to use the server message block (SMB) protocol to connect to a Windows 2000 Server, the NAT connection (ProxyDyn) of the first connected client is reset by the more recent connection of the other client.



This issue is related to a bug in Microsoft Windows 2000 Server. The bug has been fixed in Service Pack 4 for Windows 2000.
For further information, please refer to the Microsoft Knowledgebase Article:;en-us;301673



If Microsoft Windows 2000 Service Pack 4 does not solve the problem, direct hosting has to be disabled in the Windows registry.
A description how to disable direct hosting is available in the Microsoft Knowledgebase at:;en-us;301673



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