blocks|key|700048|text|当你收到这个错误的时候，听起来你可能正在使用Visual+Studio中的F5？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|700049|您可以尝试以下几种方法。最简单的方法是先点击Stop按钮，然后再点击F5。或者，当您完成调试并开始进行更改时，可以转到调试菜单，然后选择停止调试或Terminate+All。|offset|length|style|BOLD|700050|entityMap^0|0|M|4|1N|2|1W|4|21|D|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]|$D|N|E|O|F|G]|$D|P|E|Q|F|G]|$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|I|$]]

It sounds like you are probably hitting F5 in Visual Studio when you receive this error?

There are a few things you can try. The easiest is to hit the Stop button before hitting F5. Optionally, when you are finished debugging and starting to make changes you can go to the Debug menu and choose either Stop Debugging or Terminate All.

blocks|key|5140448|text|听起来好像有什么东西在吞噬你的web服务器的资源。也许你有一些资源(文件处理程序，wcf代理)正在被打开而不是关闭？当我没有关闭WCF客户端代理连接时，这种情况就会发生在我身上。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5140449|问题不一定是附加了调试器，而只是web服务器没有及时响应。请注意，消息显示“此调试器可能是因为附加了另一个调试器”。|5140450|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

It sounds like something is eating up your web server's resources. Perhaps you have some resources (file handlers, wcf proxies) that are being opened and not closed? I've had this happen to me specifically when I was not closing WCF client proxy connections.

The problem is not necessarily that you have a debugger attached, but only that the web server is not responding in a timely manner. Note that the message says "This may be because another debugger is attached".

blocks|key|5140465|text|我们使用另一种调试方法，我们再也不使用F5了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5140466|我们使用类似于：http://blogs.conchango.com/howardvanrooijen/archive/2007/06/24/Attach-to-Web-Server-Macro-for-Visual-Studio.aspx+(我们绑定到F6)这样的宏。|offset|length|5140467|这样，您只需将调试器附加到IIS。(取决于项目大小)进行更改、编译已更改的单个项目并再次附加调试器要快得多。|5140468|entityMap|0|LINK|mutability|MUTABLE|url|http://blogs.conchango.com/howardvanrooijen/archive/2007/06/24/Attach-to-Web-Server-Macro-for-Visual-Studio.aspx^0|0|8|34|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

We use another way of debugging, we never use F5 anymore. 

We use a macro kind of like: <a href="http://blogs.conchango.com/howardvanrooijen/archive/2007/06/24/Attach-to-Web-Server-Macro-for-Visual-Studio.aspx" rel="nofollow noreferrer">http://blogs.conchango.com/howardvanrooijen/archive/2007/06/24/Attach-to-Web-Server-Macro-for-Visual-Studio.aspx</a> (Which we bound to F6).

This way you simply attach the debugger to IIS. It's (depending on project size) much quicker to make you changes, compile a single project that you changed and attach the debugger again.

blocks|key|3729627|text|我发现如果我使用Firefox作为我的浏览器进行调试，就会发生这种情况。当我退出Firefox时，VS2005/8调试会话没有终止。我还没有找到解决这个问题的办法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3729628|如果这就是发生在你身上的事情，那么一个比运行iisreset更快的解决方案是在Visual+Studio中按Shift-F5组合键，这将终止当前的调试会话。然后您可以点击F5，这将启动一个新的调试会话。|3729629|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I find that this happens if I'm debugging with Firefox as my browser. When I exit Firefox the VS2005/8 debug session doesn't terminate. I have not found a solution for this (yet).

If this is what's happening with you then a quicker solution than running iisreset is to hit Shift-F5 when in Visual Studio and this will terminate the current debug session. You can then hit F5 and this will start a new debug session.

blocks|key|5140526|text|如果您有许多断点，这将减慢调试过程，因此删除不需要的断点并关闭Autos窗口将解决您的问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5140527|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you have a lot of break points this will slow the debugging process down, so remove unneeded break points and close the Autos window this will solve your problem

blocks|key|2885544|text|当另一个iexplore实例仍在运行时，通常会出现此问题。我曾经在IE崩溃时遇到过这个问题，但我仍然可以在任务管理器中看到它。一旦你“结束进程”，一切都会恢复正常:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2885545|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The issue is normally there when an another instance of iexplore is still running. I used to have the issue when my IE crashes but I can still see it in the Task Manager. Once you "End Process" everything is back to normal :)

blocks|key|3729719|text|此答案仅适用于通过IIS运行解决方案的情况。如果您通过执行以下操作打开网站/项目，您将知道这是否适用于您:从visual+studio中-->打开网站-->本地IIS+-->选择您的项目|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3729720|这个错误让我痛苦了4个小时，但我终于找到了答案。我首先尝试了iisreset+/restart。这似乎有一点帮助，但仍然收到相同的错误。|3729721|对我来说起作用的是(xp机器)添加/删除程序-->添加/删除Windows组件-->单击IIS-->单击“详细信息”。如果要通过IIS进行调试，请确保安装了Front+Page+Extensions。|3729722|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

This answer will only apply if you are running your solution through IIS. You will know if this applies to you IF you open up your website/project by doing the following:
From within visual studio--&gt;Open Website--&gt; Local IIS --&gt;Select your project
This error Kicked my butt for 4 hours but finally I found an answer. I first attempted the iisreset /restart. This seemed to slightly help but still received the same error.
What worked for me was going (xp machine) to add/remove programs --&gt; Add/Remove Windows Components--&gt; Click on IIS--&gt; Click on &quot;Details&quot;. Be sure to have Front Page Extensions installed if you are debugging through IIS.

blocks|key|5140644|text|在运行应用程序之前，转到任务管理器并结束process+aspnet_wp.exe|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5140645|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Go to task manager and end process aspnet_wp.exe before running application

blocks|key|700232|text|如果所有答案对您都不起作用，只需在任务管理器中结束处理所有与IIS相关的组件。这就是对我有效的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|700233|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If all the answers does not work for you, just end process all IIS related components in task manager. This is what worked for me.

blocks|key|5140709|text|我有生以来第一次看到这条消息，我对发生了什么感到非常困惑，因为它不是很明显该做什么。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5140710|我运行了iisreset，它只用了1秒就完成了执行，突然，我又回到了游戏中。|offset|length|style|BOLD|5140711|附注:我使用的是chrome|5140712|entityMap^0|0|4|8|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

I saw this message first time in my life and I was very confused about what is going on as it is not pretty obvious what to do. 

I ran iisreset and it took just 1 sec to finish the execution, and boom, I was back into the game.

P.S. I am using chrome

blocks|key|3729870|text|当我尝试在VS.NET中调试(2)单独的解决方案时，我遇到了这个问题，两个解决方案都使用IIS+Web服务器来启动应用程序。第一个应用程序将启动，但随后启动的也通过IIS运行的任何应用程序都将显示该错误。它似乎一次只能通过IIS中托管的VS.NET调试一个应用程序。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3729871|解决方案:从VS.NET运行项目1(放置任何需要的断点)，并直接从IIS+(而不是VS.NET)启动第二个应用程序。你在应用1(在VS.NET中运行)中的断点将在访问应用2(直接从IIS运行)时命中。|3729872|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

I ran into this issue when trying to debug (2) separate solutions in VS.NET and both were using the IIS Web Server to launch the app. The 1st application will start, but any subsequent applications started that also run via IIS will then display that error. It seems that it can only debug a single application via VS.NET hosted in IIS at a time.

The solution: run project 1 from VS.NET (place any needed breakpoints) and start the second application directly from IIS (not VS.NET). Your breakpoints in App 1 (running in VS.NET) will be hit when accessing App 2 (ran from IIS directly).

blocks|key|3729982|text|在VS2010+express中，这经常发生在我身上--通常是因为调试器停止响应。右键单击windows任务栏，选择“启动任务管理器”。ASP.NET调试器很可能会显示“未响应”状态。选择它，然后简单地终止该进程。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3729983|完成了！|3729984|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

This happens to me quite a bit in VS 2010 express - Usually because the debugger stopped responding.
Right click windows taskbar, select 'Start Task Manager'. More than likely the ASP.NET debugger will be showing a 'not responding' status. Select it and simply terminate the process.

Done!

blocks|key|3729996|text|对于我来说，当IE升级到新版本，安装更新，删除新版本的IE，计算机重新启动后，它返回到旧版本，调试问题得到解决时就会发生这种情况|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3729997|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

With me it happened when IE was upgraded to newer version, went to Installed Updates, removed new version of IE, after computer restarted it went back to old version and problem with debugging was solved

blocks|key|5141035|text|我刚刚在我的机器上解决了这个问题。我的问题是我把IE9升级到了IE10，我得到了这个错误。解决方案:删除IE+10并降级到IE+9。转到“程序和功能”-->“查看最新更新”-->找到IE+10->卸载它-->重新启动->ie+9返回->调试->工作正常。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5141036|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I just solved this problem on my machine.
My problem is that I upgraded IE 9 To IE 10 and I got this error.
Solution : Remove IE 10 and downgrade to IE 9.
Go to "Programs and Features" --> "View recent updates" --> find IE 10---> Uninstall it-->reboot--->ie 9 is back--->debug--->works OK.

blocks|key|700431|text|在Visual+Studio中点击Shift%2BF5，这将终止当前的调试会话。然后您可以点击F5，这将启动一个新的调试会话。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|700432|或|700433|关闭应用程序，重置iis，然后打开应用程序并运行它。|700434|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Hit Shift+F5 when in Visual Studio and this will terminate the current debug session. You can then hit F5 and this will start a new debug session.

or

close your application, reset iis then open your application and run it

blocks|key|3730122|text|对我来说，我打开了两个visual+studio。调试器已附加到另一个visual+studio+:)。我在第一个上停止了它，并能够附加到第二个visual+studio上。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3730123|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

For me I had two visual studio open. The debugger already was attached to another visual studio :). I stopped it on the first one and was able to attach on the second visual studio.

blocks|key|2886212|text|在这里和其他地方尝试了所有建议的解决方案(至少10种不同的方法)后，对我有效的唯一选择是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2886213|2886214|在IIS上删除网站和应用程序池|unordered-list-item|2886215|在IIS上重新创建网站和应用程序池(在我的示例中，所有配置与以前完全相同)|2886216|2886217|PS:我使用的是VS2013和IIS7.5+(Win7)。|2886218|我希望这能为其他人节省几个小时。|2886219|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|P|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|Q|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|R|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

After trying all of the proposed solutions here and in other places (at least 10 different approaches), the only option that worked for me was:

<ul>
<li>delete website and application pool on IIS</li>
<li>re-create website and application pool on IIS (in my case, everything exactly the same config as before)</li>
</ul>

PS: I am using VS 2013 and IIS 7.5 (Win7).

I hope this saves someone else a few hours.

blocks|key|2886299|text|尝试执行以下任一步骤来解决您的问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2886300|2886301|重新启动IIS服务器|unordered-list-item|2886302|清理项目的解决方案，然后重新生成|2886303|2886304|如果以上步骤都不起作用，您最终可以尝试重新启动计算机|2886305|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|N|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|P|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|L|$]]

Try performing either of the following steps to resolve your issue:

<ul>
<li>Restart your IIS Server</li>
<li>Clean the Solution of your project then build again</li>
</ul>

If above steps do not help, you can finally try restarting your machine

blocks|key|3730385|text|对我有效的解决方案是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3730386|以Administrator)|3730387|Write+iisreset+/restart|unordered-list-item|offset|length|style|CODE|3730388|
|3730389|Now，身份运行|3730390|打开命令提示符(返回到VS并调试。它将调试您的解决方案。|ordered-list-item|3730391|3730392|3730393|在我的例子中，它也适用于Visual+Studio+2013和2015。|3730394|entityMap^0|0|0|6|H|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Z|8|@$G|10|H|11|I|J]]|9|@]|A|$]]|$1|K|3|L|5|6|7|12|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|Q|7|14|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|17|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|W|$]]

The solution that worked for me:

<ol>
<li>Open Command Prompt (Run as Administrator)</li>
<li>Write <code>iisreset /restart</code></li>
<li>Now, go back to your VS and debug. It will debug your solution.</li>
</ol>

It worked for Visual Studio 2013 and 2015 too in my case.

blocks|key|5141548|text|这个问题我已经遇到过好几次了。有一次，通过采纳盖伊的建议，这个问题得到了解决：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5141549|5141550|如果这就是发生在你身上的事情，那么一个比运行iisreset更快的解决方案是在Visual+Studio中按Shift-F5组合键，这将终止当前的调试会话。然后您可以点击F5，这将启动一个新的调试会话。|blockquote|5141551|5141552|5141553|在另一种情况下，我必须:在windows任务管理器(w3wp.exe*)中终止所有IIS工作进程。您应该能够在visual+studio中点击f5进行调试。|5141554|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|M|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|N|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|O|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|P|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Q|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|K|$]]

I have had this problem a couple times. One time it was resolved by taking Guy's advice:
<blockquote>
If this is what's happening with you then a quicker solution than running iisreset is to hit Shift-F5 when in Visual Studio and this will terminate the current debug session. You can then hit F5 and this will start a new debug session.
</blockquote>
On a separate occasion I had to: terminate all my IIS worker processes in the windows task manager (w3wp.exe*). You should be able to hit f5 in visual studio to debug.

blocks|key|700650|text|非常基本--但是如果你想通过点击“浏览”从IIS上运行这个网站，那么这个网站就可以运行了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|700651|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Very basic - but check that if you try to run the web site from IIS by clicking on "Browse", the site actually runs.

blocks|key|3730639|text|即使在重新启动后也有相同的问题。基本上是这样做的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3730640|3730641|Restart+IIS|ordered-list-item|3730642|Clean+IIS+Solution|3730643|3730644|然后它又开始工作了。|3730645|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|N|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|P|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|L|$]]

Had the same problem, even after a reboot. Basically did this:

<ol>
<li>Restart IIS</li>
<li>Clean Solution</li>
<li>Rebuild Solution</li>
</ol>

Then it started working again.

blocks|key|700696|text|如果您的网站使用数据库连接，但数据库服务器不可用，也可能导致这种情况。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|700697|我花了一些时间尝试用通常的方法解决这个问题，但即使在重新启动我的工作站后，这个问题仍然存在。最后，我发现SQL+Server+(MSSQLSERVER)服务没有运行。|700698|它应该正在运行，因为它被设置为自动，但它被停止了，即使在重新启动之后。事件日志中的所有MSSQLSERVER事件看起来都是正常的，所以仍然不知道为什么它没有运行，但我现在已经将其设置为自动(延迟启动)，希望这将减少启动期间的资源争用。|700699|启动MSSQLSERVER后，消息"Unable+to+start+debugging+on+the+web+server.+The+web+server+did+not+respond+in+a+timely+manner"不再出现，服务恢复正常。|offset|length|style|CODE|700700|entityMap^0|0|0|0|H|2O|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Q|8|@$H|R|I|S|J|K]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

This can also be caused if your website uses a database connection but the database server is unavailable.

I spent some time trying to resolve this issue in the usual ways, but even after restarting my workstation, the issue remained. Eventually I found that the SQL Server (MSSQLSERVER) service was not running. 

It should have been running, as it's set to Automatic, but it was stopped, even after the reboot. All the MSSQLSERVER events in the event log appeared normal, so it remains unknown why it wasn't running, but I have now set it to Automatic (delayed start) in the hope that this will reduce resource contention during startup.

Once I started MSSQLSERVER , the message <code>"Unable to start debugging on the web server. The web server did not respond in a timely manner"</code> no longer appeared and normal service was resumed.

blocks|key|5141752|text|在cmd中键入iisreset并按enter，然后重置iis且应用程序工作正常|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5141753|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In your cmd type iisreset and press enter after that your iis is reset and your application is working perfectly

blocks|key|5141801|text|安装vs2015+update3后，我必须重新创建站点/应用程序/虚拟目录以使其正常工作。希望这对某些人有帮助。;)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5141802|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had to recreate the site/application/virtual directory to make it work after I installed vs2015 update3. Hope this helps someone. ;)

blocks|key|5141916|text|我知道这是一个古老的问题，但我最近遇到了同样的情况，并尝试了这篇文章中的每一个解决方案，但都没有运气。最后，我找到了适合我的解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5141917|checked+off>在同一对话框中关闭Panel|5141918|Uncheck+|unordered-list-item|5141919|
|5141920|5141921|5141922|查找并在+dialog|offset|length|style|BOLD|5141923|5141924|Restart+computer|5141925|5141926|Check弹出窗口中打开或关闭|5141927|5141928|互联网信息服务<代码>E116互联网信息服务<代码>E217，并确保<代码>E118互联网信息服务<代码>E219+->+<代码>E120万维网服务<代码>E221+->+<代码>E122应用程序开发功能<代码>E223+->+<代码>E124E225也已选中<代码>H226<代码>H127打开Visual+Studio，现在您的应用程序应该可以在调试模式下运行<代码>H228<代码>G229|5141929|5141930|entityMap^0|0|0|0|0|0|0|4|7|0|0|0|G|0|0|0|F|0|0|0|5I|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|14|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|15|8|@]|9|@]|A|$]]|$1|I|3|-4|5|F|7|16|8|@]|9|@]|A|$]]|$1|J|3|H|5|6|7|17|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|18|8|@$M|19|N|1A|O|P]]|9|@]|A|$]]|$1|Q|3|H|5|6|7|1B|8|@]|9|@]|A|$]]|$1|R|3|S|5|F|7|1C|8|@$M|1D|N|1E|O|P]]|9|@]|A|$]]|$1|T|3|H|5|6|7|1F|8|@]|9|@]|A|$]]|$1|U|3|V|5|F|7|1G|8|@$M|1H|N|1I|O|P]]|9|@]|A|$]]|$1|W|3|H|5|6|7|1J|8|@]|9|@]|A|$]]|$1|X|3|Y|5|F|7|1K|8|@$M|1L|N|1M|O|P]]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]]|11|$]]

I know this is an old question, but I met the same situation recently and try every solution in this post, and no luck. Finally, I found the solution that works for me:

<ol>
<li>Close Visual Studio</li>
<li>Find Turn Windows features on or off in Control Panel</li>
<li>Uncheck Internet Information Services in the popup dialog</li>
<li>Restart your computer</li>
<li>Check Internet Information Services in the same dialog, and make sure Internet Information Service -> World Wide Web Services -> Application Development Features -> ASP.NET also been checked</li>
<li>Open Visual Studio, and now your application should be able to run in debug mode</li>
</ol>

blocks|key|5141971|text|打开|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5141972|5141973|选项和设置，位于debug+|unordered-list-item|5141974|Symbols+and+Under+Servers|5141975|build+solution|5141976|iisreset|5141977|F5+solution+(确保再次取消选中Microsoft+)|5141978|下|5141979|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|S|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|U|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|V|8|@]|9|@]|A|$]]|$1|J|3|K|5|E|7|W|8|@]|9|@]|A|$]]|$1|L|3|M|5|E|7|X|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|Y|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|Q|$]]

Open

<ul>
<li>Options and Settings Under the debug </li>
<li>Symbols and unchecked Microsoft Symbol Servers</li>
<li>build solution</li>
<li>iisreset</li>
<li>F5 solution
(Be sure Microsoft Symbol Servers unchecked again)</li>
</ul>

blocks|key|696125|text|在调试2个web应用程序(1个MVC，2个是MVC+WebAPI)时，这两个应用程序都驻留在本地IIS中。确保每个应用程序使用不同的应用程序池。我遇到了同样的问题，一旦我改变了另一个的应用程序池，它就起作用了！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|696126|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

When debugging 2 web application (1 MVC and 2 is MVC WebAPI) that are both hosted in the local IIS.
Make sure that each application is using a different application pool.
I encountered the same issue and as soon as I change the app pool of the other one, it worked!

blocks|key|3731012|text|@mtkachenko+Visual+Studio+2012:+Unable+to+attach+the+process.+A+debugger+is+already+attached说：“我已经安装了调试诊断工具v2.0，因此我有了调试诊断服务，它是自动启动的，并附加到一个w3wp进程上。关闭和禁用该服务后，一切工作正常。所以，如果你在任务管理器中得到这样的错误检查进程，它可以捕获你的w3wp进程。”|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3731013|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/24605673/visual-studio-2012-unable-to-attach-the-process-a-debugger-is-already-attached^0|C|28|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

This worked for me by @mtkachenko
<a href="https://stackoverflow.com/questions/24605673/visual-studio-2012-unable-to-attach-the-process-a-debugger-is-already-attached">Visual Studio 2012: Unable to attach the process. A debugger is already attached</a>
"I have installed Debug Diagnostic Tool v2.0 and as a result I have Debug Diagnostic Service which is started automatically and attached to one of w3wp processes. After turning off and disabling this service all works fine. So if you get such error check processes in task manager which can capture your w3wp process"

blocks|key|3731073|text|在我的例子中，它得到solve，删除所有断点。看起来我有很多断点(有条件的和非有条件的)，这导致了资源的缺乏。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3731074|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case it gets solve deleting all breakpoints. Looks like I had a lot of breakpoints(conditional and not conditional) and it was causing lack of resources .

blocks|key|2887171|text|我通过在IIS服务器中创建一个新的ApplicationPool并将我的应用程序指向新的ApplicationPool来使其工作。我还删除了旧的ApplicationPool|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2887172|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I got it worked by creating a new ApplicationPool in the IIS Server and pointing my application to the new ApplicationPool. I have also deleted the old ApplicationPool

I get the following error pretty regularly when compiling in Visual Studio and running my web application:

"Unable to start debugging on the web server. The web server did not respond in a timely manner. This may be because another debugger is already attached to the web server."

Normally this is after having debug the application once already. From the command line I run "iisreset /restart" and it fixes the problem.

How do I prevent this from happening in the first place?

Visual Studio "Unable to start debugging on the web server. The web server did not respond in a timely manner."

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在Visual Studio中编译并运行我的web应用程序时，我经常收到以下错误：“无法在web服务器上启动调试。web服务器没有及时响应。这可能是因为另一个调试器已连接到web服务器。”通常，这是在已经对应用程序进行了一次调试之后。在命令行中，我运行"iisreset /restart“，它修复了这个问题。我如何从一...

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