If you want to examine, on the communication from the local machine and the server at XDebug does not work, can you see the traffic on the Port 9000, he arrives at the server:
watch -n 1 "netstat | grep 9000" //Ausgabe Every 1.0s: netstat | grep 9000 Tue Feb 7 16:01:50 2017 tcp 0 0 name:58572 host.server:9000 ESTABLISHED
and on the local PC can observing the traffic:
C:\>netstat 1 | find /i "9000" //Ausgabe TCP 172.17.20.65:9000 server:58440 HERGESTELLT TCP 172.17.20.65:9000 server:58440 HERGESTELLT
If xdebug to the local system, obtain visible an issue as above (Windows).