CentOS port closed even when iptables is stopped

centosiptablesportvnc

I've recently got a VPS running CentOS 6.X, I installed Gnome and configured VNC. vncserver is running fine, but I can't connect to it. I checked the ports from outside and noticed that port 5901 is closed. I edited the iptables and restarted the iptables service but nothing happens. I even stopped the iptables service but the port seems closed. What's going on?

Thanks in advance.

[EDIT] OK, to be honest, I'm not sure if the vncserver is running right or not. It doesn't give any errors, but there are some gnome related errors in its logs. But could this have anything to do with the port being closed?

[EDIT] These are 2 vnc configs (xstartup) that I tried:

#!/bin/sh

# Uncomment the following two lines for normal desktop:
# unset SESSION_MANAGER
# exec /etc/X11/xinit/xinitrc

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic &
# xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
xterm -geometry 1024x768 -ls -name "$VNCDESKTOP Desktop" &
twm &
~

and this one:

#!/bin/sh

( while true; do xterm; done ) &

# Uncomment the following two lines for normal desktop:
unset SESSION_MANAGER
exec /etc/X11/xinit/xinitrc

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup
[ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources
xsetroot -solid grey
vncconfig -iconic &
# xterm -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" &
xterm -geometry 1024x768 -ls -name "$VNCDESKTOP Desktop" &
gnome-session &
~

Best Answer

first verify your vnc servers is actually running :

ps -ef | grep -i vnc

then make sure it is listening

netstat -nlptu

if that does not work, look for errors in your log, and also try disabling selinue

setenforce 0

also posting your vnc config would help.

Related Solutions

Linux – Check if port is open or closed on a Linux server

You can check if a process listens on a TCP or UDP port with netstat -tuplen.

To check whether some ports are accessible from the outside (this is probably what you want) you can use a port scanner like Nmap from another system. Running Nmap on the same host you want to check is quite useless for your purpose.

Linux – How to open port 10011 in centos using iptables

Don't start by using a website to check if that port is open.

Start with your local system:
```
$ netstat -tln
```
This should you all listening ports on your system. Do you see an entry for port 10011? It will look something like:
```
tcp        0      0 0.0.0.0:10011               0.0.0.0:*                   LISTEN      
```
If you don't see that, you've got a problem. If you do see that, move on to the next step:
Use telnet to try connecting to the local port to make sure a locally originated connection works. Try this:
```
$ telnet localhost 10011
```
If something is listening on that port, this should report:
```
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
```
If instead it reports:
```
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
```
Then you probably have a problem with the application.
Is local connectivity working? Great! Now you should ideally perform the same test from another host on your local network:
```
$ telnet a.b.c.d 10011
```
Where a.b.c.d is the ip address of your system. If this fails, you probably have a local firewall problem. If it works, move on to step 4.
If connectivity on the local network is working, the remaining possibility is that there is a router or firewall between you and the outside world that is configured to block inbound traffic. Do you control your network connectivity? Does someone else? Verify that your network gateway will pass the traffic.

If this doesn't help out, let us know what fails and we'll work from there.

Best Answer

Related Solutions

Linux – Check if port is open or closed on a Linux server

Linux – How to open port 10011 in centos using iptables

Related Topic