I was trying to configure a static NAT rule to allow HTTPS traffic to a hosted web server. When I entered the last command I received “Unable
to Reserve Port 443”, this was because another service was currently using TCP
port 443.
object network Outside_to_Inside_WS
host 192.168.1.166
nat (inside,outside) static interface service tcp 80 80
nat (inside,outside) static
interface service tcp 443 443
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It was Cisco AnyConnect that was causing the problem as the
AnyConnect portal was being published on the HTTPS port. I disabled it from Configuration > Remote Access VPN >
Network (Client) Access > AnyConnect Connection Profiles. This is a
solution provided you are not using AnyConnect for user VPN.
If you are you can change the port configured to host
AnyConnect by clicking Port Settings…
