I'm using Netware 6.5 and i can access to Netstorage correctly, but when
i try to upload a file or "download for editing" i get the following error:

Server error!
The server encountered an internal error and was unable to complete your
request. Either the server is overloaded or there was an error in a CGI

If you think this is a server error, please contact the webmaster.

Error 500

What's weird is that double-clicking file i can save it on my local drive.