Recently I had to install an IPsec Remote Access VPN client on a Windows7 64-bit system.
If You are looking for an alternative to the usual Cisco client, in my opinion shrew is a good alternative. You can download the client software for free (obviously donations are welcome).
Yesterday I get the error
“session terminated by the gateway”
and my end-point logged a
“Mismatch: Overriding phase 2 DH Group(DH group 0) with phase 1 group(DH group 2)”
after giving my username/password
I solved this issue setting to “group 2” the Phase 2->PFS exchange value in my settings.