Cannot forward port 80 on my FVX538

[maier64]

I'm running latest firmware on my FVX538 and try to create a service on port 80.
Get only that error message 'Port range conflicts with default service or HTTPS port(s)'
There is no service on 80 or 443 in the service list.
What's the cause of that?
Have I overlooked something?

Thanks for your help

[jmizoguchi]

check the remote management ports for the router

[adit]

There is already a Service, HTTP, on port 80, so you can't create a custom service there.