How To Fix "Secure VPN connection terminated by peer reason 433" error in PIX

In PIX, we come across the following error:

"Secure VPN Connection terminated by Peer. Reason 433: (Reason Not Specified by Peer)"

Steps to resolve the issue

1. In order to resolve this issue, enable NAT Traversal (NAT-T) or IPsec over User Datagram Protocol (UDP) on the VPN Concentrator.

2. Allow the multiple connections from same NAT/PAT address by issuing the following command in PIX:
-- "isakmp nat-t"

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