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On one of my servers (Chameleon - host for a number of VMs running different OS versions) I have two VNC server instances (Tiger VNC) on the host system - one for a root desktop and one for a plain user desktop. This was running well, until I upgraded from F19 to F20. Now I can't get into either VNC server from my desktop.

1) I can connect fine to a BASH root shell using SSH from my desktop, so it is not a general network connectivity problem.

2) I can also connect to the VNC server from the local desktop using VNC viewer to localhost:1. So the server instance is running and ready to receive connections.

3) I have verified using tcpdump that I get the packets on TCP port 5901.

4) I have turned all IPTABLES filtering off

5) I turned SELINUX off and rebooted. I also turned SELINUX on in permissive mode. I don't think it is a security labeling issue.

Any ideas for what to try next?

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  • What happens when You run vncwiever from command line? May be some errors?
    – Mikhail Moskalev
    Commented Jan 16, 2015 at 23:58
  • Connections attempts from my windows desktops just time out.
    – Lars Poulsen
    Commented Jan 20, 2015 at 19:51
  • Connections attempts from the local command line (connecting to localhost:1) go through without a problem.
    – Lars Poulsen
    Commented Jan 20, 2015 at 19:51
  • Check VNC listen on 5901 by netstat -tlpn
    – Mikhail Moskalev
    Commented Jan 20, 2015 at 21:14
  • Hypothesis: vnc liston on 127.0.0.1, but not on 0.0.0.0
    – Mikhail Moskalev
    Commented Jan 20, 2015 at 21:15

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