A workaround would be to change the port number in both places: IanniX and Max. But my inclination is to get to the bottom of this.

So, let’s snoop around and get the rundown on open sockets:

Open a terminal:

sudo lsof -i -P

If you want to see only processes associated with that particular port:

sudo lsof -i -P | grep "2001"

If you want to create a file to attach so we can see the output too, you might do this:

sudo lsof -i -P > MyPorts.txt

or

sudo lsof -i -P | grep "2001" > MyPorts.txt

@nakatano wrote:

… there is probably something already bound to this port.
I tried to change this one but nothing happens (always the same message in the Max Window)

Cheers,
–Bob