Corrupt cache or what else could cause this?

Roland Giesler <[email protected]>
Newsgroups gmane.org.operators.ioz
Message-ID <[email protected]>
Hi all,

I recently downloaded teamviewer for debian/ubuntu from
http://www.teamviewer.com/download/teamviewer_linux.deb, but could not
install it since the file has a corrupted internal structure.  After much
deliberation with their technical support, re-downloads via Afrihost,
OpenWeb and FNBConnect and getting the same corrupted file, I received a
secure link from Teamviewer's technical support.  Lo and behold, the file is
fine, the checksum matches and can be installed.

Here are the two files' detials

-rw-r--r--    1 roland roland  19093632 2011-03-11 18:52
teamviewer_linux(2).deb
md5sum: 968f9c674ec2a6dca63682f7433bc59b
-rw-r--r--    1 roland roland  19093632 2011-03-08 11:03
teamviewer_linux.deb
ms5sum: 75be172866aa2d770a91db37e712beb0

Through all 3 ISP's the same faulty checksummed file is received, but
through WebAfrica with https (I didn't try the others), all it well.

This points to a corrupt cached copy somewhere, doesn't it?
Is there a common cache that serves there 3?
Doesn't the checksumming in a cache server prevent this kind of thing from
happening?
Surely a cache server is clever enough to see that it's copy is not the same
as the one requested?

Some comments, investigations if you are the cache admin of this common
cache, and insight and corrections if I'm misguided in my synopsis would be
welcomed

regards

Roland Giesler

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