connectivity dropouts

27 houdini's

guy with great hairdo
I have this strange troubles that specific addresses are unreachable, say wired.com or a specific article on this site.
These addresses have been reached and accessible sometimes just minutes before. Also some ports for getting mail seem closed or the server unreachable in mail (port 110 eg). After a few tries it works again.

It happens only to one computer on a network (all other computers can reach the site)

The computers are exactly the same.

the one with connectivity troubles runs 10.4.5
the other runs 10.3.9

With MainMenu: i did a user cache cleaning, a system cache cleaning (quick clean), i checked the prefs (verify and remove corrupted files), erased all browser caches, flushed the lookupD cache, and ofcourse ran disk utility.

This helped, for a few days.

I there anything else i can do? seems like some corrupted file or setting...which is it?

Anyone? much appreciated
 
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