Why is My Google Chat get Blocked (by corporate firewall) somedays but not others? [closed]

Posted by Peter on Super User See other posts from Super User or by Peter
Published on 2011-01-03T18:32:01Z Indexed on 2011/01/03 22:55 UTC
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gmail

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google-talk

I have noticed that some days I am able to chat while using Gmail, and other days I am not. It would make sense to me that I would either always be blocked, or never. But I can't figure out why it seems to change daily or weekly. Is Google constantly changing the URLs involved so that the censoring companies (they use websense where I work) have to play catch up? Or is there some other reason I'm missing?

I am more interested in the technical reason it is might be happening than in an actual work around.

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