Your official information source from the .NET Web Development and Tools group at Microsoft.
A Windows Defender and Microsoft Forefront Client Security signature file (1.53.256.0) was released at 8:45 PM (PST) on March 9, 2009 to address a Win32/PossibleHostFileHijack issue. This update modified the hosts file to prevent malicious redirection of websites. As a result, the entry for localhost may have been removed from the hosts file. When this entry is missing and a site is launched in the ASP.NET Web Development Server (aka Cassini) via Visual Studio, Internet Explorer displays “Internet Explorer cannot display the webpage”.
To resolve this issue, open C:\Windows\System32\drivers\etc\hosts and add an entry for localhost:
A new signature file (1.53.288.0) was released at 8:57 PM on March 9, 2009 that does not affect the localhost entry.
More information about this signature file and additional details about the fix can be found at http://www.microsoft.com/security/portal/Entry.aspx?name=SettingsModifier:Win32/PossibleHostsFileHijack&threatid=1758608427027806866 under the “Recovery” tab.
A Windows Defender and Microsoft Forefront Client Security signature file (1.53.256.0) was released at
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I wondered what all the comotion was about.
yeah, I ran into this today and wasted half the day before I figured it out.
Thanks for the post.
If you are suddenly unable to debug ASP.NET apps using the ASP.NET Development Server (aka “Cassini”),
After (probably) an update of ESET NOD32 I got the same message. In my case the solution was to comment OUT this line the hosts file
Everything works great now, without a localhost entry...
When you preview a Silverlight application in Expression Blend, we run the ASP.NET Web Development server
That's really a good update. Thanks for the info. I was struggling a few days with this problem.
Problem When you try to preview an ASPX or PHP page in Expression Web 2, which uses the built-in Microsoft
When you use the Preview in Browser feature in Expression Web for an ASP.NET or PHP page, Expression
Just a quick heads-up for you all, as I assume this may affect many readers of this blog. It appears Microsoft made a boo-boo with a recent Windows Defender signature file that has made the ASP.NET Development Server stop working for many folks.
ASP.NET Web Development Server -
Visual studio Development Server problem in Vista