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Old 27-07-2005
Posts: n/a

can any one tell me what this download error is

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Old 27-07-2005
Maurice N ~ MVP
Posts: n/a
Re: 0x8024401B

It means that Proxy access failed or proxy access was denied. This equates to HTTP error status 407.
Basically, proxy authentication is required.

Plain-speak: Are you using a proxy server to access the internet? Are you running some sort of anonymiser program?

Be sure you got/saw this error in your WindowsUpdate.log file.

Try turning off any antivirus program & any user application programs before going to Windows Update, and be sure you are using Internet Explorer browser.
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Old 27-07-2005
Posts: n/a
Thankyou yes I am using a proxy server or should I say the LAN settings show
a proxy server whils t the settings does not

Do you intend , or must you use a proxy server?

I must use the proxy server

I am experiencing the same problem as everyone else, and none of the
resolutions have helped me.
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Old 18-08-2005
Maurice N ~ MVP
Posts: n/a
Re: 0x8024401B

See if you have following settings:
In Internet Explorer browser, select Tools >Internet Options > Advanced Tab > (scroll down thru the list)

These are "some" of the items that I have CHECKed (selected):
Under HTTP 1.1 settings --
Use HTTP 1.1 (ON / Selected)
+ Enable / check "Use HTTP 1.1 with proxy servers" **** <<----

Internet Explorer > Tools > Internet Options > Connections Tab Click
on LAN Settings > * Uncheck* the Automatically detect settings.
Make sure _no other_ settings on this screen are enabled.
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Old 18-08-2005
Benjamin W. Slivka
Posts: n/a
Re: 0x8024401B

I got this same error on my Windows 2000 Server (SBS, actually).
I'm running ISA Server.
More and more software seems to not work with ISA Server (which is a
firewall/proxy/caching server), including MSN Investor (the ActiveX portfolio
control), the new www.Trumba.com Outlook sync application, and now Windows

It would appear that Microsoft is no longer supporting ISA Server?
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Old 18-08-2005
Rhonda A.A.
Posts: n/a
Re: 0x8024401B

I've been having the same problems, I applied this security update to my ISA
server - http://www.microsoft.com/technet/sec.../MS05-034.mspx
and windows update seems to be working fine now...
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Old 18-08-2005
Maurice N ~ MVP
Posts: n/a
Re: 0x8024401B

Thank you for your response, and shedding more light on that situation. ;)

To our other readers & posters: Please DO specify your Windows version / edition, most especially if you have a server.
(Benjamin specified his. so, this is addressed to others. )
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Old 20-08-2005
Benjamin W. Slivka
Posts: n/a
Re: 0x8024401B

That security bulletin encourages the installation of KB899753.
I installed that, and web browsing essentially stopped working for me! Ouch!
I uninstalled that KB so I could get web browsing working again!

For example, trying to visit www.microsoft.com results in:

The page cannot be displayed
There is a problem with the page you are trying to reach and it cannot be
Please try the following:

Click the Refresh button, or try again later.

Open the Web site home page, and then look for links to the information you
If you typed the page address in the Address bar, make sure that it is
spelled correctly.

Verify that the Internet access policy on your network allows you to view
this this page.
If you believe you should be able to view this directory or page, please
contact the Web site administrator by using the e-mail address or phone
number listed on the Web site home page.

HTTP 502 Proxy Error - The ISA Server requires a secure channel connection
to fulfill the request. ISA Server is configured to respond to outgoing
secure (that is, Secure Sockets Layer (SSL)) channel requests. (12211)
Internet Security and Acceleration Server
Technical Information (for support personnel)

The gateway could not retrieve the requested page.

ISA Server: janus.slivka.org

Time: 8/20/2005 12:27:08 AM GMT
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Old 20-08-2005
Robert Aldwinckle
Posts: n/a
Re: 0x8024401B

It might be a coincidence. That same symptom has been attributed
to the Google toolbar (or perhaps other third-party toolbars).
If you have that product you could try uninstalling it and see if your symptoms
change and if the patch you removed could then be reinstalled.

Are you disallowing anonymous logon through your proxy?
There are some workarounds for getting updates documented here:

You cannot download updates when you access the Windows Update
Web site from a Windows XP-based computer that is behind a firewall
or a proxy server</title>

(MSN search for
(0x8024401B OR 8024401B) site:microsoft.com

See also KB885819 which that page links to.
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Old 26-10-2005
Jean-Francois Charette
Posts: n/a
Re: 0x8024401B

I'm having the same problem. My OS a Windows 2000 Server SP4.

I have install the patch for ISA (899753) and my web browsing stop working!!
I have uninstall it and my web browing has coming back.

I have not found any issue for this problem and i need to update my server!!!

Can anyone help me?
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Old 18-05-2006
Posts: n/a
Re: 0x8024401B

I'm trying to update a Windows 2000 professional PC and getting the same
message. We are using an ISA server and are behind a firewall. I am able to
udpate all the PCs but this one. Why can't I update this one PC when I can
update every other PC (we have over 100)?
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Old 31-07-2006
Posts: n/a
Re: 0x8024401B

Well this sucks. :(

Large Corporate network, we MUST use Authenticated Proxies. Have over 2,000
XP Clients, 2003 EE Servers, and 2000 AS Servers, all running Windows Updates
with a local WSUS Server, no problems what so ever.

A week ago, one 2000 AS Server started giving this silly proxu error, now I
sit with three 2000 Servers doing exactly the same.

This is NOT a proxy issue - why would only 3 clients out of more than 2,000
all of a sudden fail???

I've been reading up on this for well over a week now, tried everything that
has been suggested, nothing works... A fix would be appreciated!
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Old 02-08-2006
Posts: n/a
Re: 0x8024401B

I have 12 workstations. These are behing our corporate firewall maintained by
our corporate centre. I have no idea how its set up or which product they are

I have persistently received this error on only 2 of our XP workstations.
After checking history on a couple of close error numbers I entered the
following in my pop up blocker settings


One of the workstations immediately worked and downloaded required updates.
The downside is that the second workstation didn't.

I then checked this site and found a suggestion which I haven't been able to
find again.

This was to enable Tools/Internet Options/Advanced/HTTP 1.1 settings/Use
HTTP 1.1 through proxy connections.

My second workstation then worked for the first 5 updates, but then failed
on 6 thru 21. At least I got some downloaded and installed and I'll try again
on my next visit.

Hope this helps someone!
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Old 17-12-2009
Join Date: Dec 2009
Posts: 1
Re: 0x8024401B

Yep, the moment I stopped using the ISA proxy, I was able to get the updates.
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Old 17-12-2009
Shenan Stanley
Posts: n/a
Re: 0x8024401B

Go techarena! Leave out all details!
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