Cannot Download Large Files Over HTTPS Using Proxy Server Combined Hotfix

ID: Q222948

The information in this article applies to:


When you attempt to download a file via HTTPS through Proxy Server 2.0 with the Proxy Server Combined Hotfix applied, the download may fail after a short amount of time. The Internet browser may stop responding or download an incomplete file. Internet Explorer may return the following error message:

Internet Explorer cannot download from the internet site [file name] from [Web_site_name or IP_Address]. Server returned invalid or unrecognized response.


A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:
The English version of this fix should have the following file attributes or later:

   Date      Time                 Size    File name     Platform
   03/16/99  01:13a               188,176 W3proxy.dll   x86
   03/16/99  01:13a               303,376 W3proxy.dll   alpha 

NOTE: If this product was already installed on your computer when you purchased it from the Original Equipment Manufacturer (OEM) and you need this fix, please call the Pay Per Incident number listed on the above Web site. If you contact Microsoft to obtain this fix, and if it is determined that you only require the fix you requested, no fee will be charged. However, if you request additional technical support, and if your no-charge technical support period has expired, or if you are not eligible for standard no-charge technical support, you may be charged a non-refundable fee.

For more information about eligibility for no-charge technical support, see the following article in the Microsoft Knowledge Base:
Q154871 Determining If You Are Eligible for No-Charge Technical Support


Microsoft has confirmed this to be a problem in Proxy Server 2.0.


This error only occurs after applying the Proxy Server Combined Hotfix described in the following Microsoft Knowledge Base article:

Q190997 Proxy Server 2.0 Combined Hotfix Information and List of Fixes
The error observed by the client browser depends on the browser used to download the file, the size of the file, and the available bandwidth used while downloading the file.

Additional query words:

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Issue type        : kbbug 

Last Reviewed: July 2, 1999