Hi do you need a external dns sever to go https://server.example.com:81 to setup dns the first time, and then do you set up ispconfig to point to https://server.example.com:81. Or should ispconfig work after the first setup with out a external dns server pointing to it.
You can access the interface with the IP, e.g. https://192.168.0.100:81/ if the domain does not point to the IP yet.