EP: KM - ZIP Files Corrupted When Downloaded

[troy_cronin2]

Backdrop: When operating in an Enterprise Portal environment and attempting to download a zip file from KM (Knowledge Management) using Internet Explorer the file appears corrupted and subsequently cannot be opened.

Testing the Behavior:

1. Download a *.zip file from Knowledge Management to your local client machine using Internet Explorer
2. Try to open the downloaded zip file on your local client machine
3. You are unable to open it receiving the error that the file is invalid or corrupted or you get "Unexpected end of archive"

Why is this happening:

Zip files uploaded into Knowledge Management can have two different MIME types configured under System Administration -> System Configuration -> Knowledge Management -> Content Management -> Utilities -> MIME Types, either application/x-zip-compressed or application/zip

Compressing the files

• This mime type can be additionally compressed causing the file to appear corrupted when downloading

Resolution

1. Check the MIME type of your zip file in the portal by clicking on the context menu of the file and going to Details -> Settings -> Properties
2. Open the J2EE Visual Administrator tool
3. Go to "Global Configuration -> Server -> Services -> HTTP Provider -> Properties -> Never Compressed"
4. Make sure that the MIME type specified for this file in the portal is added to the NeverCompressed list of the HTTP Provider
5. Also add the file extension to the NeverCompressed list of the HTTP Provider e.g. Add *.zip,application/x-zip-compressed
6. After making the changes click on the "Update" button

    7. Click on "Save Properties"

    8. Restart the J2EE