Both servers are BM3.8 SP3. Master is NW6 SP5 and slave is NW6.5sp3. We had
a perfectly working S2S VPN until yesterday, when our ISP at the slave
location dropped us repeatedly. Since then, Internet access at both sites is
fine. The VPN establishes the link, then, after a few minutes, loses it.
Within about 10-15 minutes, it will reestablish, but then, usually within a
minute or two, will lose it again. Installed the latest NICI TCPIPs (659i on
the 6.5 box and 610L on the 6.0. After the initial connection. the IKE
screen on the master says "Read trusted root cert file XXX", so it doesn't
look like an error there.

Any ideas would be greatly appreciated.