I'm trying to set a NAT rule to allow traffic from ports 20000-21000 to a server on the Inside. When I apply the changes in ASDM I receive this warning:
[WARNING] nat (Inside,Outside) after-auto 1 source static [host object] interface service PASV-NAT PASV-NAT mapped-address [WAN IP]/20000-21000 overlaps with existing static NAT in Section 1, rule 0.
I gather that something in the port range 20000-21000 is in another NAT rule (though I know none of the ones I've created are in this range), but I can't find a rule that conflicts. I checked both in ASDM and reading through the config and I can't figure out what rule it considers to be "rule 0".
Does anyone know what "Section 1, rule 0" really refers to?
Thanks