How to fix the Mozilla Firefox update error – AUS: Update XML File Malformed (200)
I was unable to update Mozilla Firefox because the error ‘AUS: Update XML File Malformed (200)’ was displayed. Below are the steps I followed to fix the Firefox update error – without having to re-install Firefox. Please note that the error message ‘AUS: Update XML File Malformed (200)’ is used to to describe more than one type of problem, so unfortunately the fix below may not work for you.
For the technically minded what I did to fix the Firefox update problem was to remove the cookie named aus2.mozilla.org. (There are detailed instructions below about how to remove the aus2.mozilla.org cookie).
The error occurs after Mozilla Firefox attempts to perform an automatic update check, or when you select the menu option ‘Help’ -> ‘Check for Updates..’. The error is displayed below.
How to fix the error ‘AUS: Update XML File Malformed (200)’ and update Firefox
1. Open Firefox and choose the menu option ‘Tools’, and then select ‘Options…’
2. Click on the ‘Privacy’ tab, and then click on ‘Show Cookies’.
3. Scroll down the list of cookies until you find the ‘aus2.mozilla.org’ cookie (they are in alphabetical order). Click on ‘Remove Cookie’.
4. Check to see if the problem has been fixed by performing an update. Select the Firefox Help menu, then ‘Check for updates..’.
5. If the problem has not been resolved please visit the mozillaZine software update page , or the Firefox support website for more details about what may be causing the Firefox update problem on your computer.
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AY wrote:
instead of the aus2.mozilla.org cookie, I removed the addons.mozilla.org cookie and the update ran fine.
Posted on 25-Feb-08 at 7:07 am | Permalink
scottcarpenter wrote:
Thanks for the feedback! I’m glad you were able to get it working.
Posted on 27-Feb-08 at 9:33 am | Permalink
Rene Trost wrote:
I had the same problem and tried all the suggested solutions I’ve found on the internet but nothing worked for.
After some hours I finally found the reason: The computers date was set 3 years back (due to a bios update)! After I fixed the date Firefox’s auto update worked again.
Posted on 13-Apr-08 at 6:05 pm | Permalink
scottcarpenter wrote:
Thanks for the feedback Rene! I can imagine that must have been really frustrating.
Posted on 14-Apr-08 at 7:31 am | Permalink
Zerosleep wrote:
Thanks mate that worked
Posted on 19-May-08 at 1:23 am | Permalink
scottcarpenter wrote:
My pleasure!
Posted on 19-May-08 at 6:55 am | Permalink
FW13 wrote:
Thanks! Worked like a charm.
Posted on 26-Jun-08 at 10:09 am | Permalink
scottcarpenter wrote:
No worries – glad you got it working.
Posted on 26-Jun-08 at 11:06 pm | Permalink
Casper Abraham wrote:
Does not work. The error is still there even after a full delete incl. registry entries and re-install. The problem started with 2.0.0.16 and stays into 3.0.1
Casper
Posted on 25-Jul-08 at 12:16 am | Permalink
isha wrote:
its still nt working ………..wht shld i do .plz tell me
Posted on 10-Nov-08 at 4:13 pm | Permalink
scottcarpenter wrote:
Hi Isha – one thing you can try is to click on the button ‘Remove All Cookies’.
Posted on 17-Nov-08 at 7:44 am | Permalink