When you enable both receive-side scaling and Internet Connection Sharing in Windows Server 2003 SP1 with the Microsoft Windows Server 2003 Scalable Networking Pack, or Windows Vista, TCP traffic stops working.

This behavior occurs because receive-side scaling and Internet Connection Sharing are mutually exclusive.

To workaround this problem, disable receive-side scaling OR Internet Connection Sharing.

To determine if Windows Vista has receive-side scaling enabled:

1. Open a CMD.EXE window.

2. Type netsh interface tcp show global and press Enter. You receive:

    Querying active state...

    TCP Global Parameters
    ----------------------------------------------
    Receive-Side Scaling State          : enabled
    \[...\]

To disable receive-side scaling:

1. Open a CMD.EXE window.

2. Type netsh interface tcp set global rss=disabled and press Enter.