Microsoft KB Archive/274690

= Internet Explorer 4.01 SP2 Does Not Establish an SSL Tunnel Through a Proxy on Port 80 =

Article ID: 274690

Article Last Modified on 9/2/2005

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APPLIES TO


 * Microsoft Internet Explorer 4.01 Service Pack 2
 * Microsoft Internet Explorer 4.01 Service Pack 2
 * Microsoft Internet Explorer 4.01 Service Pack 2

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This article was previously published under Q274690



SYMPTOMS
Internet Explorer 4.01 Service Pack 2 (SP2) cannot establish a Secure Sockets Layer (SSL) tunnel through a proxy on port 80. You receive the following error message:

12204 SSL port specified is not allowed



CAUSE
This error message occurs because Internet Explorer sends an incorrect CONNECT request to port 0 on the proxy.



RESOLUTION
A supported fix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Apply it only to computers that are 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 about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix should have the following file attributes or later:   Date          Time    Version         Size      File name ---  02-Nov-2000   11:51   4.72.3723.200   389,392   Wininet.dll



WORKAROUND
To work around this problem, use a port other than port 80 to establish an SSL tunnel through a proxy.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.



MORE INFORMATION
For details about the CONNECT/SSL tunnel request, see section 5.2 of Request for Comments (RFC) 2817.

Keywords: kberrmsg kbbug kbfix kbqfe KB274690

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