Many Corrupted download zip files from SSL secure site

[Bob Dalton]

For the last few weeks I have been having a rather perplexing problem which
I have been unable to run down.

I have been downloading zip files from a U.S. Military secure site (ie; Army
Knowedlge Online Portal-AKO) and these files are being corrupted across the
board. Previously I have had no problems downloading these same files or
opening them, and indeed I created many of them.

Example:

I zipped up a MS Word file into a zip package using WinZip 9.0. I uploaded
it to the secure site. CRC byte count was 3486 bytes.

I then immediately downloaded the same file and attempted to unzip it with
both Winzip 9 and WinXP file uncompressor and get an "invalid archive" error
message from both. CRC byte count for the file was 3484 bytes (a two byte
difference). This occurs on all systems at my company when attempting to
unzip the file and some other military users also report this problem and
have a similar OS environment.

This appears to only happen with secure site downloads as I have no problems
with downloading or unzipping files from non-secure internet sites. I also
have no problems opening files zip files which reside on any of my Software
Development Company production systems.

My OS environment:

WinXP Pro with all latest OS patches.
Internet Explorer 6.X with all latest patches.
WinZip 9
Norton AV 2004 with all latest updates and patches.

I have so far one other report from a military user not related to my
company who downloaded these same files and reporting the same problem (and
having the same environment although he is using WinZip 8).

Gut feeling is that something is corrupting the file download process that
involves SSL but that's just a hunch.

 

[Noozer]

I zipped up a MS Word file into a zip package using WinZip 9.0. I uploaded
it to the secure site. CRC byte count was 3486 bytes.

I then immediately downloaded the same file and attempted to unzip it with
both Winzip 9 and WinXP file uncompressor and get an "invalid archive" error
message from both. CRC byte count for the file was 3484 bytes (a two byte
difference). This occurs on all systems at my company when attempting to
unzip the file and some other military users also report this problem and
have a similar OS environment.

Just a guess...

Doing this with FTP? Are you making sure you are in BINARY mode before the
transfer?

 

[Bob Dalton]

No, not using FTP just using HTML download (ie; click on download link, save
to hard drive, then try to open file).

Regards;

Bob Dalton