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Outlook 2007 on Windows 7, 64-bit, will not connect to Exchange Server 2003 over IPsec VPN.

It works fine locally, and if you disconnect the local connection and do NOT reboot the computer, then Outlook will connect once you establish a VPN connection.

If I reboot remotely, and then connect via VPN, I can ping by name and I can ping by IP. I have tried turning off the Windows firewall. I have tried changing the traffic from UDP to TCP. I can connect to network shares, and name resolution to other systems is working fine.

The Exchange server is not a DC.

This has only been a problem for laptops, using a software VPN client, for the past 3 months. All of the laptops are HP.

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