Dropbox download zip corrupt

Several users have complained of a "corrupt zip folder" after downloading the file directly from the website albeit the site is built on Drupal but it is using the public download method so it should be a direct download. I have tried this myself on Windows XP dropbox download zip corrupt using both Firefox dropbox download zip corrupt and IE8.

Thanks for your help. The host isn't providing any help other than saying that they can download the file OK at their end so while I don't think I know exactly why this has been happening so frequently I am going to mark this as the answer as it will probably apply dropbox download zip corrupt most cases.

It could be large size providing more time for a connection drop, which is why you only see this problem with this file. Also, could it be the PHP script serving the download getting timed out since you mentioned Drupal? If not, you might ask your host to check for any connection problems on their end, mentioning this problem. I haven't tested with others but will try.

What could I do to ensure zip files open without any errors in future? The answer to all your questions is that the file is corrupt. Do they get this error when using actual software design to extract a. Check to make sure that either clients are getting a Content-Length header when they download the file or the transfer encoding is chunked.

Volkov 3 Paul 4, 19 If you ignore some file you will miss some content. I understand that probably mean to suggest to avoid the use of such kind of names. Ah, user is onto something. Demis 1 5. Sign up or log in StackExchange. Sign up using Facebook. Sign up using Email and Password. Post as a dropbox download zip corrupt Name. Super User works best with JavaScript enabled. MathOverflow Mathematics Cross Validated stats Theoretical Computer Science Physics Chemistry Biology Computer Science Philosophy more Meta Stack Exchange Stack Apps Area 51 Stack Overflow Talent.

It makes sense that larger files can have more connection drop issues. I am linking directly to the file so I assume Drupal doesn't get involved dropbox download zip corrupt that although it can if you change to private download method.

Several users have complained of a "corrupt zip folder" after downloading the file directly from the website albeit the site is built on Drupal but it is using dropbox download zip corrupt public download method so it should be a direct download The error message when they try to open it in Windows is: The compressed zip folder is invalid or corrupted I have tried this myself on Windows XP and using both Firefox 14 and IE8.

Publishing an MD5 or SHA-1 hash is a very common thing to do in the software development world since it's a very good way to ensure that you're files aren't corrupted. There are plenty of utilities out there for Windows, Linux and Mac that will generate MD5 and SHA-1 hashes. I use Cygwin because it's free. If file on client side have correct size, this situation might be caused by faulty memory on client PC or faulty network equipment in between. Often random bit-switching is not especially apparent in many applications, but when dropbox download zip corrupt comes to dropbox download zip corrupt that are used to check archive integrity, every bit matter and those errors become obvious.

In this case, the users are non-technical and wouldn't cope dropbox download zip corrupt checking checksums. I have re-created the zip using Windows rather than 3rd party software to see if that makes a difference.

Hashes dropbox download zip corrupt really cool because they can be used to verify to the bit level that one file is exactly the same as another. The hash for a file containing "" is f52bbaeb42dc0a97b4c1. The hash for a file containing "" is b0b7fabe83e7feac13d3dd. If I remember my ASCII right, there's only a single bit dropbox download zip corrupt between the two strings but as you can see there's a huge difference in the dropbox download zip corrupt hashes.

I had the dropbox download zip corrupt issue - created a. Following his hint, I dropbox download zip corrupt that I have a bunch of folders with a bullet in the name option-8 on the Mac keyboard. Removed all those folders, re-zipped and presto - the.

When I download via FTP using Filezilla I can open the zip file without errors. What causes the above error messages? Why does it happen some of the time and not all of the time?

So, apparently, using characters that are illegal in Windows in the filenames contained in the zip-file will cause Windows to report the " the compressed zipped file XYZXYZ is invalid " error dropbox download zip corrupt opening the.

Assuming the original file is OK which it must be if it sometimes opens I don't see why I should particularly be having this problem as often as I do with this file. I have downloaded a lot of zips in my life and only occasionally have corrupt files, but not as often as in this instance. Particularly, what could I ask my host in order to point them in the right direction to a possible solution to the problem?

If your connection quality is better, it'll probably be less likely to occur. Provide checksums for all your downloads, and get your users to verify them. You can't really avoid network issues, however. You may wish to speak to your host. One thing you can do to troubleshoot what's going on is to use MD5 or SHA-1 hashes of that zip file. I assume you have the original zip available to you offline. Using Cygwinyou can compute a SHA-1 or MD5 hash of your zip file then publish the result.

This usually occurs when one of the file names in your folders has a special character, such as quotation marks ". You have to ignore those files. But it is difficult when you have several thousand files, maybe you can try 7-zip.

Otherwise, truncation is possible. Ramhound, that's more the question really than the answer. Why should it be so inconsistent assuming the original file is OK? DavidSchwartz, that sounds promising. Can dropbox download zip corrupt clarify how one would go about checking that clients are getting a Content-Length header? DavidSchwartz I used Fiddler to check the response headers and the Content-Length header is sent with value that is the size of the file so it looks dropbox download zip corrupt all is well there.

What might be going wrong at their end? Is it only with a particular zipfile? Have you tested with zipfiles or other files of smaller or larger sizes?

Sometimes it downloads and opens correctly, sometimes I get the error. Another user is on Windows 7 and using Internet Explorer and has got this message after several download attempts. As FTP and HTTP download works at times, then I assume the file on the server is not corrupted but something happens during download and re-uploading the file would not fix anything and I have tried this.

By posting your answer, dropbox download zip corrupt agree to the privacy policy and terms of service. Sign up or log in to customize your list. Stack Exchange Inbox Reputation and Badges. Questions Tags Users Badges Unanswered. Super Dropbox download zip corrupt is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute: Dropbox download zip corrupt how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top.

I am running Windows XP. I was getting that same message and was unable to open a zip file until I downloaded winzip off the internet. Then, from inside winzip, I was able to easily open the file and drag and drop it onto my desktop.

Green 3 9. This makes sense in many situations. I am dealing with very non-technical users, though, who would not cope with hash checking, dropbox download zip corrupt that's good advice generally.

That is probably the most helpful and complete answer, thanks. I will look into what you say and most likely come back and mark this as the answer. In the meantime, why do you think it would be so inconsistent given different users on different connections and software set-ups?

I created the zip file using IZArc but I am not so sure the method of creation is relevant in this case as it sometimes works. The download is probably corrupted or truncated incomplete. Check if the downloaded filesize is same as the size on the server. The download could be truncated due to the connection being dropped, which is something random - it might happen and might not happen.