When trying to forward network services by NX (ssh,ftp,http,cups), the port is created but the connection doesn't work.
This has been reproduced on Mac 10.13 and Windows 10.
 

Workaround:
1. Mac client and Windows server. On the Windows side ping IP from local port section. Network ports connections on Mac side started to work.

2. Windows client and Mac server. On the Windows side ping IP from remote port section. Then network ports connections on Mac side started to work