last part:
StartServer
Connect to 127.0.0.1 on port 20085
Connection closed
StopServer
Cannot process request because the process (113644) has exited.
Connection failed
SocketException: System.Net.Sockets.SocketException (0x80004005): Connection refused
at System.Net.Sockets.TcpClient…ctor (System.String hostname, System.Int32 port) [0x0006d] in <70a6c5ad50804ff79dacac874c9c41a4>:0
at PLink.Connect (System.String ĪĪĩĩĪĩĩĩĪĩĪĩĩĪĩĪĩĪĪĩĩĩĩĪĩĩĪĩĪĪĩĪĩĩĪĩĩĩĪĩĩĩĪĩĪĪĩ, System.Int32 ĪĪĩĪĪĩĪĪĩĪĩĩĩĪĪĩĩĪĪĪĪĩĩĪĪĩĩĩĩĩĪĪĩĩĪĩĩĩĪĪĩĩĪĩĩĩĪ) [0x00042] in :0
StartServer
Connect to 127.0.0.1 on port 20085
Connection closed
StopServer
Connection failed
SocketException: System.Net.Sockets.SocketException (0x80004005): Connection refused
at System.Net.Sockets.TcpClient…ctor (System.String hostname, System.Int32 port) [0x0006d] in <70a6c5ad50804ff79dacac874c9c41a4>:0
at PLink.Connect (System.String ĪĪĩĩĪĩĩĩĪĩĪĩĩĪĩĪĩĪĪĩĩĩĩĪĩĩĪĩĪĪĩĪĩĩĪĩĩĩĪĩĩĩĪĩĪĪĩ, System.Int32 ĪĪĩĪĪĩĪĪĩĪĩĩĩĪĪĩĩĪĪĪĪĩĩĪĪĩĩĩĩĩĪĪĩĩĪĩĩĩĪĪĩĩĪĩĩĩĪ) [0x00042] in :0
StartServer
Connect to 127.0.0.1 on port 20085
Connection closed
StopServer
Cannot process request because the process (113647) has exited.
Connection failed
SocketException: System.Net.Sockets.SocketException (0x80004005): Connection refused
at System.Net.Sockets.TcpClient…ctor (System.String hostname, System.Int32 port) [0x0006d] in <70a6c5ad50804ff79dacac874c9c41a4>:0
at PLink.Connect (System.String ĪĪĩĩĪĩĩĩĪĩĪĩĩĪĩĪĩĪĪĩĩĩĩĪĩĩĪĩĪĪĩĪĩĩĪĩĩĩĪĩĩĩĪĩĪĪĩ, System.Int32 ĪĪĩĪĪĩĪĪĩĪĩĩĩĪĪĩĩĪĪĪĪĩĩĪĪĩĩĩĩĩĪĪĩĩĪĩĩĩĪĪĩĩĪĩĩĩĪ) [0x00042] in :0
StartServer
and the result of netstat:
sudo netstat -tulpn | grep LISTEN
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1/init
tcp 0 0 127.0.0.1:5939 0.0.0.0:* LISTEN 1221/teamviewerd
tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN 747/systemd-resolve
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 800/cupsd
tcp6 0 0 :::111 :::* LISTEN 1/init
tcp6 0 0 ::1:631 :::* LISTEN 800/cupsd
As I noted earlier it is on an Ubuntu 20.04 Linux machine.