IIS Unable to start debugging on the web server

---------------------------
Microsoft Visual Studio
---------------------------
Unable to start debugging on the web server. Could not start ASP.NET debugging. More information may be available by starting the project without debugging.

Click Help for more information.
---------------------------
OK   Help  
---------------------------

Solution: Please check to make sure the app pool you are debugging against is running. If its stopped, visual studio will give this error message

Visual Studio Web performance or Load testing, requests always go through a proxy

In, Visual Studio 2013, Web Performance Testing project, Select your WebTest
In root element, select properties and check the proxy value. This (proxy value) is always set to "default"

Sometimes its preferable for tests to not go through a proxy as a proxy has its own bottleneck. Visual Studio will not allowing you to change this value to blank (to not use a proxy). If you remove the proxy value, VS will put default back again automatically.

This is because "default" means use the system proxy while running tests. If you do not want your test runs to use a proxy, disable the proxy in the system.
To do this, go to Internet Explorer, Select Tools, Internet Options, Connections, LAN Settings, and un-check all proxy enable check boxes

Visual Studio 2012, 2013 - Error HRESULT E_FAIL has been returned from a call to a COM component.

Visual Studio 2013 giving the below error while trying to debug a website project.

---------------------------

Microsoft Visual Studio

---------------------------

Error HRESULT E_FAIL has been returned from a call to a COM component.

---------------------------

OK   

---------------------------

this was coming when trying to debug a website project. It turned out the start URL in the project was configured as https://localhost/myapp?param1

it started working once I removed the parameter from the URL. ie; https://localhost/myapp

Not sure though why Visual Studio is not accepting the parameter. Was able to add the parameter and hit the browser again once the browser page came up