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Old 10-22-2014, 05:01 AM   #1
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Registered: Jan 2012
Posts: 21

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VNC connection from Windows 7 to CentOS 6.5 for one user not authenticating

Hello everyone,

I have installed VNC (tigervnc-server.x86_64) on CentOS 6.5 successfully. These are the entries of /etc/sysconfig/vncservers

VNCSERVERARGS[1]="-geometry 1280x768"
VNCSERVERARGS[2]="-geometry 1280x768"

These are my firewall entries allowing VNC on CentOS 6.5:

[root@server ~]# cat /etc/sysconfig/iptables
# Firewall configuration written by system-config-firewall
# Manual customization of this file is not recommended.
-A INPUT -p icmp -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp -m multiport --dports 5901:5902,6001:6002 -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited

Yes, I know it's a bad idea to connect as root but I created it as a test.

I have set the vncpasswd for both accounts and made sure the vncserver is running.

Originally both users were able to connect fine from a Windows 7 system with VNC Viewer 5.2.1 on port on port 5901 for the user account and 5902 for the root account. However, both computers rebooted and now I'm unable to connect with the user account. I can connect fine with root account but the user account.

I have ranned the vncserver :1 command for the user account and I receive this message:

[user@server .vnc]$ vncserver :1
A VNC server is already running as :1
[user@server .vnc]$

I have checked the logs but in /home/user/.vnc/server.local:1.log for anything obvious but nothing get's logged.

I have eliminated this being an firewall issue by stopping iptables. The errors that I receive on Windows 7 VNC Viewer are "Authentication failure" and "Too many security failures"

To summarize, I'm able to connect with the root account on port 5902 but not as the regular user on 5901. This happened after a reboot. Thanks in advance for your advise on this issue.

Last edited by student23; 10-22-2014 at 05:16 AM.
Old 10-22-2014, 06:34 AM   #2
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Registered: Jan 2012
Posts: 21

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Ok, I found out that I have to run the vncserver :1 command with the user account for my VNC ports (5901, 6001) to open up and connect. However, I don't have do this for the root account, the ports (5902, 6002) because they start automatically.

I added this entry to the /etc/syconfig/vncservers file

VNCSERVERS="1:user 2:root"

I have searched online and they suggest to run the command chkconfig vncserver on but I did already and it's on.
Old 10-22-2014, 09:52 PM   #3
Registered: Mar 2008
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Thanks for the update and solution. I assume it is fixed?
Old 10-23-2014, 03:49 AM   #4
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Registered: Jan 2012
Posts: 21

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For now yes. However, if I reboot the computer the vncserver session or profile for the user account won't start automatically. I guess I will have to add a script to run the command for the user account when it logs in to run this command 'vncserver :1'. I don't understand why it will work for the root account and not for a regular account.


centos6, vnc

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