Hello and welcome.
AFAIK, ipcop is a turn-key firewall with IPSec for VPN.
There have been a number of changes to IPSec on OpenBSD since 4.0, which is no longer supported. For example, in OpenBSD 4.1, support for multiple SAs with the same IP addresses was added. I'm not sure what your problem may be, as I'm not an IPSec user, but this may be the root cause of your problem.
Support for 4.0 ended in November of 2007, when 4.2 was released.
The current release of OpenBSD is 4.3, and 4.4 is expected to be released November 1.
The OpenBSD Project only supports the two most recent releases, currently 4.3 and 4.2.
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