Forum Thread

Pk Zip issue with transferred file

roykirk1 735 166 March 16, 2016 at 12:24 PM
Hi

Vendor sent us 8 zipped files via secure ftp. Files look fine.

When we try to open them however, we get zero files/zero bytes.

Any idea what could be causing this? I know the sender was fiddling with binary vs ascii option on the ftp interface, but could that cause this? She says no change in browsers, zip version or anything since she successfully sent us files (last year).

Thanks in advance for your help!!!

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#2
Quote from roykirk1 View Post :
Hi

Vendor sent us 8 zipped files via secure ftp. Files look fine.

When we try to open them however, we get zero files/zero bytes.

Any idea what could be causing this? I know the sender was fiddling with binary vs ascii option on the ftp interface, but could that cause this? She says no change in browsers, zip version or anything since she successfully sent us files (last year).

Thanks in advance for your help!!!
Yes, ASCII FTP will destroy files. Always use binary.

The standard way to handle this is to take a checksum of the file on both ends. Any checksum is fine (even insecure ones like md5 or crc32). I don't have a good windows GUI tool recommendation handy (I just use the unix ones in cygwin), but Microsoft apparently publishes a command line tool: https://support.microsoft.com/en-us/kb/889768.
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#3
7zip is better.
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E finita la cuccagna

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#4
Both are entirely capable of the task at hand though. A corrupt 7zip file won't decompress any better than a corrupt zip file. Zips also have the advantage of working on approximately any OS released in the last 10 years by default, so it's pretty common to see them used by vendors to ship data.
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#5
Quote from quotidian View Post :
Yes, ASCII FTP will destroy files. Always use binary.

The standard way to handle this is to take a checksum of the file on both ends. Any checksum is fine (even insecure ones like md5 or crc32). I don't have a good windows GUI tool recommendation handy (I just use the unix ones in cygwin), but Microsoft apparently publishes a command line tool: https://support.microsoft.com/en-us/kb/889768.
This - especially the checksum. Most vendors publish this type of data anyways. I would also check your AV software. Zip files are one of the most popular ways viruses are spreading these days.
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#6
THANKS. Repped those I could (got "have to spread rep around before repping" liquidretro and quotidian again.

Binary did the trick. They resent everything with binary selected and now everything works fine. What a waste of 2 days of us trying to figure out what the problem was. :-(
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