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When I try to open a website when my connection is down or while my modem is starting up, my Mac flags this url as unreachable.

When the connection is finally open and internet available, I still can not reach this web site as if the Mac doesn't try to reach it again and still displays me the error page. Other web sites (that I didn't try to reach while offline) are reachable...

Is there a way to reset this information so that the Mac really tries to reach url ?

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Is this a permanent flag that is being set? Doesn't just hitting the refresh button not sort things out if the site is back up? – Philip Regan Oct 1 '10 at 13:07
I've to close the session and then i works when I logon again... I think the problem occurs when my modem is on, but when the connexion to internet is not yet available. Maybe it's the modem that keeps to give this "bad" answer ? – Rabskatran Oct 1 '10 at 13:55
Closing session is not enough. I've to reboot the Mac to access those websites. That's why I think the Mac is involved, not the modem. – Rabskatran Oct 5 '10 at 8:32

I don't think you are seeing anything out of the ordinary here. My connection goes down all the time, and it's never been immediate for me, but refreshing does bring the site up faster.

My theory is that it just takes another amount of time for the browser to sort out that the connection is available again; the browser periodically pings the system to see if there is a connection available, and the lag you're seeing is waiting for the process to run its course again. Perhaps it pings once a minute as opposed to once every few seconds for fear of bogging down the processor.

Computers, as a rule, don't like it when things unexpectedly fail and thus take longer to get back up and running as opposed to when everything goes right.

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