Visual Studio :: Unable To Connect To Development Server - Error Message On Debugging
May 17, 2010
I just started getting the error message "Unable to Connect to the ASP.net Development Server" when debugging a website with VWD 2008 (everything was fine in the past). My system is Windows Vista with Windows Live OneCare firewall. I have reviewed other postings related to this problem, and they indicate firewall setting problems - settings not allowing VWD internet access. However, my settings on the "Windows Live OneCare Firewall Advanced Settings" tab specifically allow VWD.
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Jun 7, 2010
I developed a website project using visual studio 2008 and language used is c#. It was working fine till yesterday[i.e., It compiled and also i could run it using the asp.net development server by pressing ctrl+f5] and today when i tried to run it says "unable to connect to asp.net development server". I tried to reinstall visual studion 2008 and even now its not working. Also when i go to websites n asp.net configuration option it say the same error "unable to connect to asp.net development server". I absolutely no idea about why this error popped up. I got my project demo. day after n how can this be set right.
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Aug 18, 2010
I'm getting th error "unable to connect to the asp.net development server 2008"
It's been working fine for months and all the sudden.I'm fairly new at this so if you have a fix I will need details.
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Mar 3, 2010
I'm getting this problem with one of my web projects. I've looked at [URL] and other suggestions around the place, none of which apply here. The odd thing is, it's occurring with *one* of my new web site projects, but not another one. Odd again is that they're both 100% fresh sites, created with the "New Web Site" option in the File menu, within a day of each other, and nothing has been done to them, apart from a bit of "hello world" html. WebSite1 was created first, and Cassini worked when I first created it the other day. A day later, I created WebSite2 and Cassini worked (and still works) with that one.
However, when I open WebSite1, I get the above error code - again, it was working fine the other day, and WebSite2 works fine. I've compared their .sln file - so differences apart from the VWDPort number used, and of course the path to the site and various GUIDs. Everything else is identical. Same with comparing web.config files. No differences there at all. So I'm stumped - why would Cassini start up fine with WebSite2 (and subsequent sites I create) but suddenly stop working for the WebSite1 project, when it was working ok a couple of days ago?
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Nov 23, 2010
Not too long ago I was given a new PC with windows 7 Professional on it. Before, I had vs 2008 running on win xp which worked OK. I started getting error msg (Unable to connect to ASP.NET development server) after I installed vs 2008 (version 9.0.30729.1 sp1 vs team system dev. edition) and ran one of my projects and even a simple test project. The first msg shows the syntax of webdev.webserver with an example in the bottom. I can get this error by running the project or by showing any page in the browser. I noticed that file WebDev.WebServer.EXE does not appear in the folder C:WindowsMicrosoft.NETFrameworkv3.5. If that's the only reason why I am having this problem than how can I fix it. I was told that .net framework 3.5 works on top of .net framework 2.0?! I just want to sort out this .net framework mess on my new machine. I am willing to uninstall all .net framework and start fresh. Another thing that I am willing to try is to get from a coworker the WebDev.WebServer.EXE (from the .net framework 3.5 folder) and see if it works.
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May 12, 2010
I have VS 2008 with SP1 installed on Win XP. I have .NET 3.5 with SP1 installed When I ran and opened an existing project for the first time, I got the below error WebDev.WebServer.exe has encountered a problem and needs to close. After this error, I continusly get "Unable to connect to the ASP.NET Development Server. whenever I run the website. I checked the internet and ASP.NET forum and tried all the following Making port numbers auto assign Making it to a specific port number using the Custom web server Tried creating new web site and checking Replaced WebDev.WebServer.EXE after downloading it from a website My anti virus have not blocked any websites as such I tried resetting VS settings by running devenv /resetsettings what else might be the problem?
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Sep 29, 2010
I got these errors while trying to run a web application using vs 2008, The first error is this: >Application has generated an exception that could not be handled. >process ID=0x1130 (4400), Thread ID=0xe6c (3692). And when I press OK a second dialog reports this error:>unable to connect to the asp.net development server. I reinstalled, repaired and re registered msdbg2.dll and edited hosts file but still get this error. I need to debug an application but I can't. This error is on a 'Win 2003 server enrterprise service pack 1' with a vs2008 team system installation. What can I do to remove this error and run and debug my application?
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Jun 27, 2010
i am getting this error while trying to view in browser. i checked the host file and the 127.0.0.1 localhost line wasn't commented
i am on windows server 2003 and my IIS is working fine as projects on VS2008 are working fine
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Aug 2, 2010
When debug a project, then error message show:
"Error while trying to run project : Unable to start debugging on the web server. The project is not configured to be debugged."
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Aug 6, 2010
I am getting an error "Unable to start debugging on the web server..." while running as web application in VS2005. But the error seems only for this application. I created a test application, both in VS2005 and VS2008, and found no issues in running these applications.
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Mar 10, 2010
i have sql server 2008 and visual studia 2008 install in my system when i open a new website project and then use the asp.net administration tool in that when i go for security tab under that one.
i want to enable roles but it displaying error that unable to connect to sql server database.
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Jun 3, 2010
I get this error when I hit F5 in VS 2008. I have checked that Windows authentication is enabled on the site and it is. I can mannully attach the debugger to the IIS process and it works. What could be wrong? I have tried alot of things without success.
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Mar 7, 2011
I'm trying to debug my web application on my localhost machine in Visual Studio 2010 and I keep getting this error: "unable to start debugging on web server. The Microsoft Visual Studio remote debugging monitor(MSVSMON.exe) does not appear to be running on the remote computer."
Is there a way I can turn this off as I'm not trying to make any attempts debugging remotely.
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Apr 25, 2010
Debugging using the ASP.NET Development server is extremely slow to initialize. The behavior I'm getting is that if I launch the DevServer from VS2008, the first attempt to load a page takes minutes. After that, it's fine. Before the first page load, the DevServer UI responds to input normally (I can bring it up from the status area, use its context menu, and move the window around) until the first page load comes in. Then it shows the busy cursor (spinning blue ring) for 2-6 minutes before finally completing. There is no significant processor or I/O activity during this. After that, it runs normal speed, quite fast.
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May 7, 2015
When I press f5 to run my website a prompt message appears displaying unable to connect to asp.net development server. I have tried to restart vs 2010 but that did not work...
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Aug 11, 2010
I am getting this error, without any further details, when attempting to debug my ASP.Net project in VS2010. There are other developers using the same tools and code who are not having this problem therefore I know the problem is not in the web.config file. I have found several suggestions when googling the issue and tried them all to no avail. I uninstalled and re-installed VS2010 along with the .Net 4 framework. I made sure Anonymous as well as Windows authentication is enabled in IIS. I uninstalled and reinstalled IIS. I am at a loss. I can attach to the process and debug the ASP.Net code that way, but what I really need to be working on is a Silverlight app that is called from the ASP.Net and the breakpoints don't work in Silverlight when I attach to the process manually.
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Jul 13, 2010
I am having a simple web site created using VS.NET 2003 using .NET Framework 1.1 The web site project builds properply. When I hit F5 (to debug) it displays "Error while trying to run project" message. I am able to debug console and windows service applications. Recently I installed VS.NET 2010 (.NET Framework 4.0). I think prior to this it was working fin. ENV: Windows XP and IIS 5.1
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Sep 29, 2010
I'm getting "Cannot connect to ASP.NET development server" almost every time I stop the ASP.NET server before restarting the project in debug mode. It can take between 15 seconds and 2 minutes to get the error message, and Visual Studio is frozen.
Sometimes I get three in a row, and I have to wait 2 minutes each time, or go into Task Manager and kill to process. Then I have to start Visual Studio 2010 again, which is at least three times slower than Visual Studio 2008 to open.
It's *extremely* annoying. I know I don't have to close the server if the code has changed, but sometimes I simply want to restart my website in debug mode (there is a cache on most web service calls, so this clears the cache). A workaround is to add "foo" code to a class and restart the project.
I'm running Visual Studio 2010 Professional on Windows Server 2008. I'm running the Visual Studio Power Tools too, with the latest update.
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Jan 25, 2011
I am using an Visual studio 2010 ultimate edition. And here i have getting an error " unable to connect to the asp.net development server " while i try to run the Web Application by pressing F5 key from Web Application Project. Can any tell me whats the problem and how can i resolve it.
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Jun 16, 2010
I used to have nice development environment at XP for .Net web application development. I have now installed Windows 7 and going to take it as my new machine. I already installed VS2005 and I'm able to
build a project. IIS is working fine and I'm able to open the web application in the web browser. Windows firewall is Off.When I click Start Debuggin on Visual Studio 2005 on Windows 7 I get following error:Unable to start debugging on the web server. Unable to connect to the web server. Verify that the web server is running and that incoming HTTP requests are not blocked by a firewall. What could be wrong? Something to configure in the IIS?
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Jul 19, 2010
Unable to start debugging on the web server. The IIS worker process for the launched URL is not currently running.I'm running Windows 7 64 bit, VS 2008 sp1.When I first try to debug I get the error msg above. I wait a few minutes (presumably some service is starting) and debugging will start but no breakpoints are recognized.Some of the things I've tried:Changing the binding of my site from a static IP to "*".
Enabled windows authentication.made sure localhost = 127.0.0.1 in the hosts file.The website was built under windows xp and whatever version of IIS ships with xp. My web config has no errors that I know of but might be missing something required for iis 7 (??)
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May 7, 2010
Whenever i run the project this problem occur Can any one give me solution. should i have to delete webdev.webserver.exe and install another is this the right solution for my problem.
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Jul 22, 2010
i was working asp.net 3.5 (VS2008) . till yesterday My asp development server was working but today it is giving error " Unable to connect ASP.Net Development Server"
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Jan 7, 2010
I just finished upgrading my vista to 7 and with some problems and one of them is every time I open my file and tried to debug it or run in browser, I always get a warning saying = Unable to connect to the ASP.NET Development Server I thought some problems when I upgrade so I reinstall the software but no luck
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Mar 28, 2010
I recently purchased a new computer running Windows 7 Home, and after installing Visual Studio 2005 and SQL Server 2005 Express, I am unable to connect to the database using the "Connect To Database" wizard. I get the following error:
"This server version is not supported. You must have Microsoft SQL Server 2005 Beta 2 or later."
The version of SQL Server 2005 Express I've downloaded is directly from the Microsoft site and I also downloaded the SP3 to be used with Windows 7, x64 (which I presumed was a later version of the database). I am able to connect to the database programatically, but I would like to get the wizard functionality working as well (as I am unable to add a database to my projects, using the "Add New Item" wizard either).
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