Comments on: Strange Problem – Unable to Connect to the ASP.Net WebServer on Localhost http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/ The Technical Jibber Jabber of Steven Robbins Fri, 30 Jul 2010 05:59:46 +0000 hourly 1 http://wordpress.org/?v=3.0 By: Aashish http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-286 Aashish Wed, 14 Jul 2010 11:11:53 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-286 First of all, I'm a Newbie to .NET. Secondly, The problem I'm facing is I am not being able to change the ::1 to comment and update 127.0.0.1. Must tell you that it is my personal laptop and I am the administrator. I'm really confused what to do. I also installed the Cassini webserver but don't know how to use it First of all, I’m a Newbie to .NET. Secondly, The problem I’m facing is I am not being able to change the ::1 to comment and update 127.0.0.1. Must tell you that it is my personal laptop and I am the administrator. I’m really confused what to do. I also installed the Cassini webserver but don’t know how to use it

]]> By: Gordo http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-280 Gordo Wed, 23 Jun 2010 21:13:44 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-280 I had a similar problem with IE8 and found this worked for me: http://stackoverflow.com/questions/663144/why-cant-i-debug-from-visual-studio-2005-after-installing-ie8 IE 8 has a feature called Loosely-Coupled Internet Explorer (LCIE) which results in IE running across multiple processes. http://www.microsoft.com/windows/internet-explorer/beta/readiness/developers-existing.aspx#lcie Older versions of the Visual Studio Debugger get confused by this and cannot figure out how to attach to the correct process. You can work around this by disabling the process growth feature of LCIE. Here's how: Open RegEdit Browse to HKEY_LOCALMACHINE -> SOFTWARE -> Microsoft -> Internet Explorer -> Main Add a dword under this key called TabProcGrowth Set TabProcGrowth to 0 Since you are running on Windows Server 2003, this is all you should need to do. If you run into the same problem on Vista or newer, you will also need to turn off protected mode. I had a similar problem with IE8 and found this worked for me:

http://stackoverflow.com/questions/663144/why-cant-i-debug-from-visual-studio-2005-after-installing-ie8

IE 8 has a feature called Loosely-Coupled Internet Explorer (LCIE) which results in IE running across multiple processes.

http://www.microsoft.com/windows/internet-explorer/beta/readiness/developers-existing.aspx#lcie

Older versions of the Visual Studio Debugger get confused by this and cannot figure out how to attach to the correct process. You can work around this by disabling the process growth feature of LCIE. Here’s how:

Open RegEdit
Browse to HKEY_LOCALMACHINE -> SOFTWARE -> Microsoft -> Internet Explorer -> Main
Add a dword under this key called TabProcGrowth
Set TabProcGrowth to 0
Since you are running on Windows Server 2003, this is all you should need to do. If you run into the same problem on Vista or newer, you will also need to turn off protected mode.

]]> By: rebervt http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-141 rebervt Thu, 05 Nov 2009 19:44:28 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-141 Your clear explanation of the issue and fix saved me hours and hours of time. Thanks a million. Your clear explanation of the issue and fix saved me hours and hours of time. Thanks a million.

]]> By: Mahendran http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-128 Mahendran Wed, 30 Sep 2009 13:24:29 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-128 I am Also Facing Problem I Have Windows Vista installed with iis 7 , IE 8 i was unable to run the web application ( Visual Studio 2008 ) C#.net Application i am geeting unable to establish connection with local host Any one please help me to solve this I am Also Facing Problem I Have Windows Vista installed with iis 7 , IE 8
i was unable to run the web application ( Visual Studio 2008 ) C#.net Application
i am geeting unable to establish connection with local host

Any one please help me to solve this

]]> By: srobbins http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-82 srobbins Mon, 20 Apr 2009 07:20:30 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-82 It's not the same problem, but I'd suggest you take a look at your proxy setting and make sure that bypass proxy for local addresses is set (if you use a proxy) and possibly add 127.0.0.1/localhost explicitly to the bypass list. It’s not the same problem, but I’d suggest you take a look at your proxy setting and make sure that bypass proxy for local addresses is set (if you use a proxy) and possibly add 127.0.0.1/localhost explicitly to the bypass list.

]]> By: kalyan http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-78 kalyan Sat, 18 Apr 2009 05:34:41 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-78 I am having a problem with running an ASP.Net project on my laptop that is running XP professional (SP2) and IIS 5.1. When I start a new ASP.NET project in Visual Studio I get the error message: ”Unable to create Web Project ‘WebApplication1’. Could not find a web server at ‘localhost’ on port 80. Please check to make sure that the web server name is valid and your proxy settings are set correctly. If you are sure that everything is correct, the web server may be temporarily out of service”. If I try accessing an existing ASP.Net project I copied from another Machine I get the error: “Unable to open Web project . Unable to validate that the file path ‘C:\Inetpub\wwwroot\’ matches the URL path ‘http://localhost/’. A connection with the server could not be established. When I try to load up the IIS default page in Internet Explorer (using ‘http://localhost/’ as the address) it tells me ‘WWW disabled’ even though IIS appears to be running fine. I can however load the ASP.NET project start page by using 127.0.0.1 as the address rather than localhost. It looks like localhost is not mapped to 127.0.0.1 but when I ping both in the command window I get replies indicating that they are mapped? I am having a problem with running an ASP.Net project on my laptop that is running XP professional (SP2) and IIS 5.1. When I start a new ASP.NET project in Visual Studio I get the error message:

”Unable to create Web Project ‘WebApplication1’. Could not find a web server at ‘localhost’ on port 80. Please check to make sure that the web server name is valid and your proxy settings are set correctly. If you are sure that everything is correct, the web server may be temporarily out of service”.

If I try accessing an existing ASP.Net project I copied from another Machine I get the error:

“Unable to open Web project . Unable to validate that the file path ‘C:\Inetpub\wwwroot\’ matches the URL path ‘http://localhost/’. A connection with the server could not be established.

When I try to load up the IIS default page in Internet Explorer (using ‘http://localhost/’ as the address) it tells me ‘WWW disabled’ even though IIS appears to be running fine. I can however load the ASP.NET project start page by using 127.0.0.1 as the address rather than localhost. It looks like localhost is not mapped to 127.0.0.1 but when I ping both in the command window I get replies indicating that they are mapped?

]]> By: krishna http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-76 krishna Sun, 05 Apr 2009 10:23:56 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-76 unable to connect to asp.net webswerver getting this prolem with vs2008 plz tellmehow to cinfigure iis unable to connect to asp.net webswerver getting this prolem with vs2008 plz tellmehow to cinfigure iis

]]> By: Joannes Vermorel http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-75 Joannes Vermorel Sat, 28 Mar 2009 21:41:09 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-75 Thanks for the fix. Same problem was happening to me. Still, I have no idea was what causing this change in the host file. Thanks for the fix. Same problem was happening to me. Still, I have no idea was what causing this change in the host file.

]]> By: Scott Marlowe http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-73 Scott Marlowe Mon, 23 Mar 2009 16:55:01 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-73 Not sure how or why this became a problem for me, but you nailed it. I'm changing my hosts now. Thanks! Not sure how or why this became a problem for me, but you nailed it. I’m changing my hosts now. Thanks!

]]> By: Gregguz http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-66 Gregguz Thu, 12 Mar 2009 15:10:44 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-66 Thanks. Got the same problem from today mornig. That did the trick. Thanks. Got the same problem from today mornig. That did the trick.

]]> By: srobbins http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-65 srobbins Thu, 12 Mar 2009 11:02:31 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-65 @Mike Yep, and it did occur after a nightly update/reboot cycle so that could well be the culprit. Thanks for the comment. @Mike Yep, and it did occur after a nightly update/reboot cycle so that could well be the culprit. Thanks for the comment.

]]> By: srobbins http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-64 srobbins Thu, 12 Mar 2009 11:01:10 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-64 @Marc That wasn't me, but it's the same problem I think. @Marc That wasn’t me, but it’s the same problem I think.

]]> By: Mike Ormond http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-63 Mike Ormond Thu, 12 Mar 2009 10:46:00 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-63 Just curious. Are you running Windows Defender? A few people started reporting this earlier in the week. Looks like it may be related to a Defender signature update which was quickly fixed. You should find everything works again if you put things back the way they were. No easy way for me to test this though as I run Forefront client security which disables Defender. Mike Just curious. Are you running Windows Defender? A few people started reporting this earlier in the week. Looks like it may be related to a Defender signature update which was quickly fixed. You should find everything works again if you put things back the way they were. No easy way for me to test this though as I run Forefront client security which disables Defender. Mike

]]> By: Marc Gravell http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/comment-page-1/#comment-62 Marc Gravell Thu, 12 Mar 2009 08:46:03 +0000 http://www.grumpydev.com/2009/03/12/strange-problem-unable-to-connect-to-the-aspnet-webserver-on-localhost/#comment-62 Interesting; I'll watch out for that one. BTW, was this 633968 on SO? Interesting; I’ll watch out for that one. BTW, was this 633968 on SO?

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