I am adding a comment here with links to some related information. It appears
that Knetworkmanager may be to blame for all of this:
http://kubuntuforums.net/forums/index.php?topic=3084031.0
http://ubuntuforums.org/showthread.php?t=367541
I am adding Knetwrokmanager to the list of culprits.
** Also affects: knetworkmanager (Ubuntu)
Importance: Undecided
Status: New
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konqueror cannot access internet with cache enable
https://bugs.launchpad.net/bugs/131767
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