Public bug reported:

I am running Kubuntu 9.10 on a laptop.

A few seconds after I connect to the network, either using WLAN or
Ethernet, the KDE desktop (i.e. the KDE menu button, the task bar and
all widgets on the desktop and the task bar) freeze.

In addition, web browsers (google chrome, firefox, wget) although
responsive, are unable to connect to the Internet. The problem seems to
affect TCP sockets in general, since 'telnet www.google.com 80' also
does not work. However, 'ping www.yahoo.com' works normally.

Killing knetworkmanager de-freezes the system after 1 or 2 minutes.
Logging out and in of KDE also de-freezes the system. Connecting again
causes the freeze.

The problem occurred occasionally in the past and I usually worked
around it by logging out and in. Now it has become systematic.

Unfortunately, since I cannot connect to the Internet from the affected
system I cannot report the bug via the standard tools.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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TCP sockets and plasmoids freeze when connecting to the network
https://bugs.launchpad.net/bugs/531186
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