Using most recently available netcode samples:
Opening frontend scene and enabling “Relay Support” to create a client-host instance results in this error:
“Driver with ID 1 uses IPCNetworkInterface. The endpoint used for listening is using Port == 0 but a non-zero port is required for this interface. The interface can’t start listening”
A̶t̶t̶e̶m̶p̶t̶i̶n̶g̶ ̶t̶o̶ ̶f̶i̶x̶ ̶u̶s̶i̶n̶g̶ ̶a̶ ̶s̶p̶e̶c̶i̶f̶i̶e̶d̶ ̶p̶o̶r̶t̶ ̶u̶s̶i̶n̶g̶ ̶N̶e̶t̶w̶o̶r̶k̶E̶n̶d̶p̶o̶i̶n̶t̶.̶A̶n̶y̶I̶p̶v̶4̶.̶W̶i̶t̶h̶P̶o̶r̶t̶(̶)̶i̶n̶s̶t̶e̶a̶d̶ ̶o̶f̶ ̶p̶r̶o̶v̶i̶d̶i̶n̶g̶ ̶A̶n̶y̶I̶p̶v̶ ̶i̶n̶t̶o̶ ̶s̶e̶r̶v̶e̶r̶ ̶l̶i̶s̶t̶e̶n̶i̶n̶g̶ ̶r̶e̶s̶u̶l̶t̶s̶ ̶i̶n̶:̶
"̶S̶o̶c̶k̶e̶t̶ ̶c̶r̶e̶a̶t̶i̶o̶n̶ ̶f̶a̶i̶l̶e̶d̶ ̶(̶e̶r̶r̶o̶r̶ ̶6̶7̶1̶0̶8̶8̶6̶5̶:̶ ̶"̶A̶d̶d̶r̶e̶s̶s̶ ̶i̶n̶ ̶u̶s̶e̶ ̶(̶0̶x̶0̶4̶0̶0̶0̶0̶0̶1̶)̶ ̶-̶ ̶O̶n̶l̶y̶ ̶o̶n̶e̶ ̶u̶s̶a̶g̶e̶ ̶o̶f̶ ̶e̶a̶c̶h̶ ̶s̶o̶c̶k̶e̶t̶ ̶a̶d̶d̶r̶e̶s̶s̶ ̶(̶p̶r̶o̶t̶o̶c̶o̶l̶/̶n̶e̶t̶w̶o̶r̶k̶ ̶a̶d̶d̶r̶e̶s̶s̶/̶p̶o̶r̶t̶)̶ ̶i̶s̶ ̶n̶o̶r̶m̶a̶l̶l̶y̶ ̶p̶e̶r̶m̶i̶t̶t̶e̶d̶.̶ ̶ ̶(̶W̶i̶n̶E̶r̶r̶o̶r̶:̶0̶0̶0̶0̶2̶7̶4̶0̶)̶"̶
N̶o̶ ̶m̶a̶t̶t̶e̶r̶ ̶t̶h̶e̶ ̶s̶e̶l̶e̶c̶t̶i̶o̶n̶ ̶o̶f̶ ̶p̶o̶r̶t̶ ̶c̶o̶u̶n̶t̶ ̶(̶o̶t̶h̶e̶r̶ ̶t̶h̶a̶n̶ ̶0̶ ̶o̶f̶ ̶c̶o̶u̶r̶s̶e̶)̶,̶ ̶s̶o̶c̶k̶e̶t̶ ̶c̶r̶e̶a̶t̶i̶o̶n̶ ̶a̶l̶w̶a̶y̶s̶ ̶f̶a̶i̶l̶s̶.̶
Edit: Ignore the second half, that was my fault.
