NoMachine cannot connect to Debian server, error 138

Question

I can't connect to the KDE GUI installed on my Debian server, using NoMachine. Connection over SSH (Both through PuTTy as X forwarding) works just fine, but somehow I can't figure out how to connect using NoMachine and the NX protocol.

I installed the NoMachine server on my Debian server (nomachine_5.1.54_1_amd64.deb), which seems to work fine. It listens on port 4000. I disabled the firewall on the server.

Then I installed NoMachine on my windows system and tried to connect to the server, using the same IP address as with the ssh connection, and the login credentials I use to login on the server.

I approach the server from another network, using a VPN connection and the HTTP proxy for the network connection.

I tried the tips provided online, but can't get it to work. I still get the error message:

Could not connect to the server.
Error is 138: Connection timed out

Help would be highly appreciated!

Answer 1

您应该使用“欢迎” GUI中显示的相同IP地址，如所附的图像（从nomachine网站获取）一样： nomachine welcome gui显示连接的位置