Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Programming
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Databases
Mail Systems
openSolaris
Eclipse Documentation
Techotopia.com
Virtuatopia.com

How To Guides
Virtualization
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Windows
Problem Solutions
Privacy Policy

  




 

 

Chapter�33.�Troubleshooting Problems

Problems that aren't

Frozen apps (how to kill them)

Things won't open

That scary crash dialog

Reporting Bugs

More Resources

Networking and X

J Hall

Misconfigured networking can often be the cause of KDE applications launching slowly, or in the worst case not launching at all. Your X-Server has a very powerful client/server interface and is very network aware.

X uses the hostname to create both a unique key for authorization, and to figure out where (via $ DISPLAY ) to send the actual windows it's drawing on screen. If your computer doesn't know its own name, it will spend inordinate amounts of time trying to look itself up, a fate you can avoid by simply teaching your computer what its own name is.

Check your /etc/hosts file and ensure there is an entry for localhost that looks something like this at the top of the file (after any comments).

127.0.0.1	localhost

You also should add your computer's fully qualified domain name, short name, and its usual IP address if it has a static IP. If your IP address is assigned dynamically using DHCP you can simply use the address for the loopback device.

127.0.0.1	hal.btl		hal 		(for dhcp)
192.168.0.1	hal.btl		hal		(static)

Make sure that your firewall is not so restrictive that it stops packets to the loopback device. For example in iptables if the default rule on the INPUT chain for this device is set to anything other than >ACCEPT this will cause performance problems in X. To check this, you can type in:

%




iptables-save

 | 

grep

 
lo





-A
 

INPUT

 
-i
 

lo

 
-j
  

ACCEPT

 

The rule -A INPUT -i lo -j ACCEPT should always work, unless there are other misconfigured rules (Such as a DROP on the OUTPUT chain)




 
 
  Published under the terms of the GNU General Public License Design by Interspire