I received a zip file containing data captured with tcpdump on a Linux system. When I tried to open the zip file on my MacBook Pro laptop running OS X El Capitan by double-clicking on the file within the Finder, I saw an "unable to expand" error message stating "Error 2 - No such file or directory." A Microsoft Windows user who downloaded the same zip file reported that he was unable to open it, either. When I tried to unzip the file from a Terminal window using the unzip utility, I saw an "End-of-central directory signature not found" error message.
$ file AS2_Captures.zip AS2_Captures.zip: Zip archive data, at least v2.0 to extract $ unzip AS2_Captures.zip Archive: AS2_Captures.zip End-of-central-directory signature not found. Either this file is not a zipfile, or it constitutes one disk of a multi-part archive. In the latter case the central directory and zipfile comment will be found on the last disk(s) of this archive. unzip: cannot find zipfile directory in one of AS2_Captures.zip or AS2_Captures.zip.zip, and cannot find AS2_Captures.zip.ZIP, period. $
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