Troubleshoot refused VNC Connection in CentOS 7

Troubleshoot refused VNC Connection in CentOS 7Posted on March Istvan szarka -2 Comments

The other day I connected to my CentOS 7 computer from Windows via RealVNC Viewer. Everything went fine, but after I left the machines unattended for a short time, the connection froze Had to shut CentOS down and boot it again. When I tried to connect again, I got a error message saying something like "The connection is refused by the host Co Mputer " or similar, I can ' t remember exactly. I rebooted CentOS several times, but nothing changed. Now I had to connect a monitor and the necessary peripherals to the box and start troubleshooting.

First, I checked the status of the VNC service:

[Email protected] desktop]# systemctl status [email protected]:2.service-l[email protected]:2.service-remote Desktop s Ervice (VNC)   loaded:loaded (/etc/systemd/system/[email protected]:2.service; enabled)   active:failed (Result : Exit-code) since Sat 2015-02-28 14:37:00 CET; 10min agofeb 14:37:00 Localhost.localdomain systemd[1]: [email Protected]:2.service:control process exited, code=exit Ed Status=2feb 14:37:00 Localhost.localdomain systemd[1]: Failed to start Remote Desktop Service (VNC). Feb 14:37:00 localhost.localdomain systemd[1]: Unit [email Protected]:2.service entered failed state.

The VNC service apparently failed to start. If you don ' t know why I used [email protected]:2.service , please read my earlier post about configuring VNC. I tried to start the service, but it kept failing:

[Email protected] desktop]# systemctl start [email protected]:2.servicejob for [email Protected]:2.service failed. See ' systemctl status [e-mail Protected]:2.service ' and ' journalctl-xn ' for details.

As I was digging through the internet, I found some clues about corrupted session files that had to being deleted to solve th is problem. The files were supposed /tmp/.X11-unix to being in the directory (capital X11, Linux is case-sensitive!). When I checked the contents of/tmp, I found this:

There was no /.X11-unix directory inside. The issue was, that's this folder is hidden and such items can have only been seen if you put after, like this -la ls :

Now I saw the folder I am looking for at the end of the list. Inside /.X11-unix were the session files:

The corrupted file belonging to "Vncuser", the user I configured for VNC access, was X2. I removed it rm /tmp/.X11-unix/X2 with the command. Then, I started the service, rebooted the computer and I were able to seamlessly connect to my CentOS machine through VNC.

Troubleshoot refused VNC Connection in CentOS 7