I ran into this issue too, had a customer with a lot of remote sites all
connecting back to main office with 100D. I could see the VPN was a huge
bottleneck as I could RDP from remote site to main office server and if
I copied a 75MB file and pasted ...
I created a ticket with FGT support in the end and found it is an issue
with the current firmware. From CLI, we could create the VIP without
issue but the gui would always give the error "Conflicts with the
External IP of another VIP" We're on v6.2.0...
I've been running into this issue too. How did you get around it? It
seems like a firmware update issue because if I edit some of the
existing VIPs I receive this error but if I cancel out, they work fine.
Did you find a way to get around this issue?