why does my google chat get blocked (by corporate firewall) somedays but not others?

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 18:56 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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