Here are the instructions on Windows to find out what ports QoppaPAS is listening to:

1- Find what is QoppaPAS Process ID

Open a command line prompt and type in the following command:

tasklist | findstr QoppaPAS

which on my machine returned

QoppaPAS.exe                  1464 Services                   0     99,372 K

QoppaPAS PID (Process ID) is 1464 (second column).

2- Find what ports QoppaPAS is listening to

netstat -aon | findstr 8084

which on my machine returned

TCP 0.0.0.0:8090 0.0.0.0:0 LISTENING 1464
TCP 0.0.0.0:8093 0.0.0.0:0 LISTENING 1464

QoppaPAS is listening to ports 8090 and 8093