Author Topic: WSUS download corruption  (Read 7005 times)

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kwg

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WSUS download corruption
« on: August 12, 2005, 10:23:58 PM »
Since upgrading from ISA Server 2000 to ISA Server 2004 a week ago, downloads via Windows Server Update Services (WSUS) have been failing with messages similar to the following:

Quote
Content file download failed. Reason: CRC verification failure. Source File: /msdownload/update/v3-19990518/cabpool/windowsserver2003-kb896727-x86-enu_05885a331f44f3bc706abb12b012b1582f7aa7ad.exe Destination File: d:\WSUS\WsusContent\AD\05885A331F44F3BC706ABB12B012B1582F7AA7AD.exe.

The error persisted for several days. However, when I disabled the Avast MS Proxy/ISA provider and the Standard Shield, the downloads completed without error.

By the way, I have excluded *.microsoft.com in the in the MS Proxy/ISA provider, but the corruption occurred nevertheless.

Is this a known issue? Can anyone suggest a way to correct this problem?

Ken

Offline Vlk

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Re: WSUS download corruption
« Reply #1 on: August 17, 2005, 01:41:17 PM »
Could please try replacing the file C:\Program Files\Microsoft ISA Server\AvPxyFtr.dll with the following version: http://www2.asw.cz/misc/AvPxyFtr.dll . That should fix the problem.

BTW the "Microsoft Firewall" service needs to be stopped before you do this - otherwise the file will be locked.


Thanks
Vlk
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kwg

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Re: WSUS download corruption
« Reply #2 on: August 23, 2005, 08:38:47 AM »
Thanks! The new ISA plug-in works great!

Warning for anyone else attempting the same fix:

If you download the new AvPxyFtr.dll file with the Avast ISA filter running, Avast will corrupt its own download. If you then install this corrupted file, ISA Server will refuse to restart. If you attempt to download AvPxyFtr.dll once again, this time with Avast disabled, you'll find that ISA Server has cached the corrupted file and ISA Server will still refuse to restart.

I suppose it's possible to purge the ISA Server cache, but I don't know how offhand. It's also possible that the initial download would not have been corrupted if Avast had been disabled in the first place.

Finally, I downloaded the new AvPxyFtr.dll file on my home computer, which is not running Avast. I then transferred this file to the server via floppy disk. This procedure seems to have worked perfectly.

As a test, I deleted one of the local WSUS downloaded files and then synchronized my server with Microsoft WSUS. The replacement file downloaded successfully. Last night, Microsoft issued another Critical Update. It was downloaded without problem. Thus, it seems that Avast's new AvPxyFtr.dll file is not corrupting downloads as it did previously.

Ken
« Last Edit: August 24, 2005, 09:46:09 AM by kwg »

Offline Vlk

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Re: WSUS download corruption
« Reply #3 on: August 26, 2005, 04:47:44 PM »
Interesting note (sort of Head 22 :-)), thanks for sharing this info.
If at first you don't succeed, then skydiving's not for you.