Have a client that has a VPN setup between 2 BorderManager servers.

Server 1 is NW5.1 w/ SP7e and BM 3.6
Server2 is NW5.1 w/ SP7e and BM 3.5

This setup previously worked until applying SP7e
At this point we get an error in the BM audit log that states.

(SKIP) Construction of SA Failed for peer Server2@IP Address
Unknown Security preference for Encryption

I am contemplating back reving the IP stack to the SP6 version.
Any other ideas or sugestions?