Yesterday, Microsoft announced a bunch of new bug fixes, which nearly every Windows machine on the Net is eagerly downloading. Unfortunately, a client of mine is having problems with a transparent Squid proxy with Windows machines behind it. Apparently, Windows Update fetches updates in chunks, about 2K at a time. (It is not clear whether this is done as subranges of the file or as identical queries which produce different results; I don't see any "@" signs in the URLs in the cache log, though.) In any case, each time a client requests a 2K chunk, the Squid proxy is re-fetching an entire file that's 2 MB or larger from a parent cache. Needless to say, this is completely killing their bandwidth. Have others seen this behavior? Is there a known fix?

--Brett Glass



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