In VNC while connecting to remote desktop, you may get this errors.
unable to connect to host: No route to host (113)
unable to connect to host: Connection refused (111)
In host machine iptables is running and is blocking the port 5901. Kill all the vncserver desktop in the host machine and run the following command in the terminal. Type the password for the user when prompted.
sudo iptables -I INPUT 1 -p tcp --dport 5901 -j ACCEPT
The above command will add the port 5901 to iptables in accept mode. Now save the iptables and start the vncserver in host machine then try connecting it remotely.
To save the Iptables
Fedora users use the following command to save it.
sudo /etc/init.d/iptables save
Ubuntu users do the following steps
Run the following command to save the current rule-set to the file “iptables.rules” in etc directory. Type the password for the user when prompted.
sudo sh -c "iptables-save > /etc/iptables.rules"
To apply the rules automatically, modify the interfaces file under /etc/network/ directory and add the below line to the end of your interface. You need to know which interface your using.
post-up iptables-restore < /etc/iptables.rules
To add, use the following command. You can use your favorite editor to edit the interfaces file, here i am using gedit.
sudo gedit /etc/network/interfaces
The above command will open the interfaces file in gedit. Now copy and paste this line “post-up iptables-restore < /etc/iptables.rules” at the end of your interface.
After modification your interfaces file should be looking like this.
auto lo iface lo inet loopback post-up iptables-restore < /etc/iptables.rules
or like this
auto eth0 iface eth0 inet loopback post-up iptables-restore < /etc/iptables.rules
Thats it. Hope this will be helpful for you!!!