Connectivity issue after Windows Server 2003 Service Pack 2

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You cannot host Transmission Control Protocol (TCP) connections when Receive Side Scaling is enabled in Microsoft Windows Server 2003 with Service Pack 2 (SP2). The TCP connections are reset.

This problem occurs if you use Network Address Translation (NAT) and if the host computer is configured to be an Internet Connection Sharing host server computer. For example, Microsoft Internet Security and Acceleration Server running on Windows 2003 Service Pack 2.

This problem may also occur when you use Windows Server 2003 Service Pack 1 (SP1) together with the Windows Server 2003 Scalable Networking Pack.

To work around this problem, disable Receive Side Scaling when the computer is configured as an Internet Connection Sharing gateway. For example, Microsoft Internet Security and Acceleration Server running on Windows 2003 Service Pack 2.

For more detailed information on how Receive Side Scaling works and how to disable it, please refer to this knowledge base article:

https://support.microsoft.com/?id=927695