271264 - Most downloaded files are corrupted

Status: VERIFIED DUPLICATE of bug 270811

(Toolkit :: Downloads API, defect)

Description

[Jorge Handl]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; es-AR; rv:1.7.5) Gecko/20041108 Firefox/1.0
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; es-AR; rv:1.7.5) Gecko/20041108 Firefox/1.0

When downloading files to disk (as oposed to opening them directly with some
program) I get corrupted files. When opening those same files directly from the
web page, they download ok.
This happens on a FireFox 1.0 clean installation, in a Windows XP Home box
running also Zone Alarm. No addons or extensions. It seems to work well on a W2K
box (the one I'm using to report this).
When using IE the files download ok.

Reproducible: Sometimes
Steps to Reproduce:
1. Right-click on a link to a downloadable file
2. Choose "save as"
3. Once DM says it's completed, open the downloaded file


Actual Results:  
The file is corrupted.

Expected Results:  
Download the file without corrupting it.

Looks very similar to bug #236045, which was reported for FireFox 0.8 and
appears as "resolved".
I can't say exactly how the files are corrupted; I will try to determine if
they're incomplete like in bug #253328. Also I'll try disabling Zone Alarm and
see if it makes a difference. And I will try to update this report with some
example download link.

Comment 1

[Hermann Schwab]

see Bug 270811 	Errors in downloaded files using download manager
and Bug 270811 Comment #15
http://forum.zonelabs.org/zonelabs/board/message?board.id=access&message.id=14528#M14528

seems to be a ZA issue

Comment 2

[Jorge Handl]

Thanks for the links, Hermann! 

My problem seems to be exactly as described by Jorn in Bug 270811, so it is very
likely that changing settings in ZoneAlarm will do the trick.

I had no time last night to test it at home, will do it tonight and report back.

Thanks!

Comment 3

[Jorge Handl]

It works now! 

I disabled all privacy settings in Zone Alarm and now FireFox downloads ok. I
will try enablig one by one until I find the highest privacy setting that still
allows good downloads.

Strange that this affects only FireFox and not IE... Also, I compared the good
and bad files with good old windiff, and they are *completely* different! Almost
same size, but the contents look as if the IP packets were all mixed... Very
strange.

Anyway, symptom (if not problem) solved!

Thanks!

Comment 4

[Ali Ebrahim]

*** This bug has been marked as a duplicate of 270811 ***

Comment 5

[Jorge Handl]

Hmmm. I wouldn't say this is solved if nobody knows why ZA only affects FF...
Maybe it is a ZA problem, but if both sides blame the other, you're in for a
long list of duplicates of this bug... But who am I to tell you how to manage
your bugs! :)

Comment 6

[Ali Ebrahim]

The fact is that Firefox is accessing the network, as web browsers do. ZA is
intercepting Firefox's normal communications, and breaking them. If ZA is going
to be doing intercepting, it should bear the burden of not breaking what its
intercepting in the process.

Comment 7

[Jorge Handl]

ZoneAlarm support staff could just as easily answer "The fact is IE can access
the files just fine, using exactly the same interface FF is using, so the
problem has to be in FireFox."
Look, I don't know where the problem is, and I couldn't care less since I got
*my* problem solved, but I think that for the benefit of others, developers of
both FireFox and ZoneAlarm should look into this matter a bit more deeply, and
just saying "the problem is not mine" will not help. 
That's just my uninformed opinion, I may very well be wrong, and I don't intend
to start a fight, so: Thanks for the help, over and out.

Comment 8

[timeless]

reporter: have you contacted zonealarm tech support? and please comment in bug
270811 instead of this bug.