Error: "Server Returned Invalid or Unrecognized Response" (187650)

The information in this article applies to:

Microsoft Internet Information Server 4.0
Microsoft Proxy Server 2.0

This article was previously published under Q187650

We strongly recommend that all users upgrade to Microsoft Internet Information Services (IIS) version 6.0 running on Microsoft Windows Server 2003. IIS 6.0 significantly increases Web infrastructure security. For more information about IIS security-related topics, visit the following Microsoft Web site:

http://www.microsoft.com/technet/security/prodtech/IIS.mspx

SYMPTOMS

When using Microsoft Internet Explorer, you may receive the following error message:

Internet Explorer cannot open internet site <Web_site_name or
IP_Address>. Server returned invalid or unrecognized response.

CAUSE

Web publishing has been disabled in Proxy Server.

WORKAROUND

Start the Internet Service Manager (ISM), which loads the Internet Information Server snap-in for the Microsoft Management Console (MMC).
Click Web Proxy, then click Properties on the Action menu.
On the Publishing tab, click to select the Enable Web Publishing check box.
Click OK, and then quit the MMC.

Modification Type:	Minor	Last Reviewed:	6/23/2005
Keywords:	kbprb KB187650 kbAudDeveloper