If you have a computer running Linux and Firefox browser and you are facing problems surfing www.linkedin.com , or you are using the unlucky combination of
1) Dlink ADSL Router OR
2) Dlink ADSL Router and Wireless Access Point AND
3) Computer Running Linux AND
4) Firefox Browser
you may be unable to surf www.linkedin.com and there is already a bug tracking on launchpad referencing this problem "Bug 314713 "
All what you need to do to solve this problem is to change your Network Card MTU value, the value that I tried and works is 1360.
Necessary command to change MTU of Network interface on linux is "sudo ifconfig eth0 mtu 1360"
Hope that help and happy Surfing