Unable to load  certain websites after 10.5.3 upgrade

Since upgrading to 10.5 .3, I haven't been able to load a few websites using either Safari, Camino or Firefox. Error message is "Safari can’t open the page “http:///” because it can’t find the server “www.politico.com”.
Safari Activity Window has these items:
file:///Applications/Safari.app/Contents/Resources/
file:///Applications/Safari.app/Contents/Resources/
file:///Applications/Safari.app/Contents/Resources/compass.icns
file:///Applications/Safari.app/Contents/Resources/ErrorPageHelpButton.tif
file:///Applications/Safari.app/Contents/Resources/page-load-errors.css
I have tried all the usual repairs and tests, and creating new user account, etc., but problem persists.
Is it possibly something related to 10.5.3 It is only a few sites, but the browsers stall and can't find the server of the requested site?

If it is happening in all browsers, then it can't be a Safari cache issue.
Are you using a proxy server? (Look in Network Preferences -> Advanced (for your active connection to find out). If so, try removing it.
Also, try opening Terminal and typing:
ping www.politico.com
Does it resolve the name successfully? If not, there is the possibility of a DNS issue on your computer/network.

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