What to do if Tigervnc connection fails on Debian

In a Debian system, if the TigervNC connection fails, follow these steps to troubleshoot:

1. Check the VNC server status

First, confirm that the VNC server is up and running. Use the command ps -ef | grep vnc to view the VNC server process.

2. Confirm the port number

Please check if the port number you are using is correct. TigervNC uses TCP port 5900 n by default (n is the monitor number, for example: display 1 corresponds to port 5901).

3. Firewall settings

If a firewall (such as ufw) is enabled, make sure that the VNC port is allowed to pass. Use the following command to open port 5901 (please modify the port number according to your monitor number):

 sudo ufw allows 5901/tcp
sudo ufw reload

4. VNC server configuration

Check the VNC server configuration file (usually located at /etc/systemd/system/vncserver@:1.service ) to make sure that User and Group settings are consistent with your logged-in user.

5. View log files

Check the VNC server log file (usually located in the ~/.vnc/logs directory, for example ~/.vnc/myfreax.myfreax.local:1.log ) to find the specific reason for the connection failure.

6. Desktop environment configuration

If you are using the Xfce desktop environment, make sure the ~/.vnc/xstartup file exists and is configured correctly, and give execution permissions:

 chmod x ~/.vnc/xstartup

7. Update and restart VNC service

Update VNC server software to the latest version and restart VNC service:

 sudo apt-get update
sudo apt-get upgrade tigervnc-standalone-server tigervnc-common
sudo systemctl restart vncserver@:1.service

8. Client connection settings

In a VNC client (such as TigerVNC Viewer), enter the Debian hostname or IP address correctly, as well as the password you set on the VNC server.

If the above steps still fail to resolve the problem, please provide specific error information for further troubleshooting. You can also seek help in the relevant technical forum or community.

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