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IntroductionWelcome to the Microsoft ASP.NET Support Voice column! My name is Akshay N. S., and I am with the ASP.NET developer support team. I have been working with ASP.NET support for nearly two years. This month in the ASP.NET Support Voice column, I am going to describe how to implement remote debugging for ASP.NET Web applications by using Microsoft Visual Studio 2005. I would like to thank my technical lead, Jerry Orman, for his incredible help!
Remote debugging is considered one of the toughest topics in ASP.NET, but it's a really cool feature and is really helpful when we cannot have a local Web server or when we have to store the applications at a centralized location. This column covers how to set up and use remote debugging in Visual Studio 2005.
Remote debugging setup is greatly simplified in Visual Studio 2005. Although the DEBUG verb is still sent to the Web site to ensure that the remote process is running, all remote debugging scenarios except T-SQL debugging use the Remote Debugging Monitor (Msvsmon.exe).
For more information about what's new in the Visual Studio 2005 debugger, visit the following Microsoft Developer Network (MSDN) Web site:
Msvsmon.exe has a user-friendly interface that makes it easier to use. The setup for remote debugging in Visual Studio 2005 is quite simple. You need to run Msvsmon.exe on the remote server prior to debugging. You can install the Remote Debugging Monitor from the Visual Studio 2005 CD or simply run Msvsmon.exe from a share without installing anything at all on the Web server.
To learn more about ASP.NET debugging, visit the following MSDN Web site:
Why remote debugging?You can consider using remote debugging when you have the following situations:
- You cannot run a Web application locally.
- You cannot have a local Web server, and you need to develop an application for Internet users or you want an application to be deployed on a Web server.
- The application is not available to you locally.
- You want to store the application at a centralized location.
The Remote Debugging Monitor (Msvsmon.exe)The Remote Debugging Monitor (Msvsmon.exe) is a small application that Visual Studio 2005 connects to for remote debugging. During remote debugging, Visual Studio 2005 runs on one computer (the debugger host) and the Remote Debugging Monitor runs on the remote computer along with the application you are debugging.
The Remote Debugging Monitor runs as a Microsoft Windows application. The user interface shows that the Remote Debugging Monitor is running and makes remote debugging easy to set up.
Configuring Msvsmon.exe for remote debuggingYou can configure the Remote Debugging Monitor for remote debugging in one of two modes:
- Windows Authentication mode
This mode uses the operating system's built-in security to provide a high level of security. The Kerberos and NTLM protocols are used to authenticate all requests. Remote procedure call (RPC) packet privacy is used to encrypt data traveling over the network when you debug native code or .NET Framework-based code on computers that are running Microsoft Windows Server 2003, Microsoft Windows XP, Microsoft Windows 2000, and future Microsoft Windows operating systems.
To set up remote debugging in Windows Authentication mode, visit the following MSDN Web site:
- No Authentication mode
This mode has no security. Visual Studio 2005 will send the current user's user name to the remote debugger, but this information is used for informational purposes and is therefore not verified. No Authentication mode enables faster debugging on slow networks, but it is not secure and should be used only on secure networks. This mode should never be used on a network that might have hostile traffic. Additionally, this mode should never be used to remotely debug across the Internet. No Authentication mode only supports native debugging.
To set up remote debugging in No Authentication mode (for native code only), visit the following MSDN Web site:
You connect to an instance of the remote debugger by entering the server name in the Attach To Process dialog box or by entering the server name into the debugging properties for a project. To open the Attach To Process dialog box, click Attach To Process on the Debug menu or on the Tools menu.
Debugging another user's computerSuppose we want to perform remote debugging to a different user's computer with the different user logged on to the computer. We have to consider two primary issues:
By default, only administrators and the user running the remote debugger have access to connect to the remote debugger.
Visual Studio 2005 needs to know to which instance of the remote debugger you want to connect. If the same user is running the remote debugger and Visual Studio 2005, Visual Studio 2005 will be able to find the remote debugger without you telling it which user is running the remote debugger.
However, if a different user is running the remote debugger, Visual Studio 2005 must be told to connect to domain_name\user_name@remote_computer instead of just being told to connect to remote_computer.
- Adam doesn't have the remote debugger on his computer. To set up the remote debugger, Molly decides to share out the Program Files\Microsoft Visual Studio 8\Common7\IDE\Remote Debugger directory on her computer. She creates a file share called Remote.
- Adam runs \\MollyComputerName\Remote\x86\Msvsmon.exe.
- After the remote debugger starts, Adam clicks Permissions on the Tools menu to configure the remote debugger by using the Permissions dialog box. He gives Molly permission to debug.
Note Adam could also configure the remote debugger by passing the /allow option when the remote debugger starts.
- Molly starts Visual Studio 2005.
- To open the Attach to Process dialog box, Molly clicks Attach to Process on the Tools menu.
- Molly connects to Adam's computer by entering adventure-works.com\Adam@AdamComputerName in the Qualifier box.
- Under Available Processes, Molly selects the worker process that her application is using and then clicks Attach.
- Molly opens a browser and provides the URL to the remote application. The execution stops where the breakpoint is placed in the application.
Running the Remote Debugger Service in ASP.NET and in other server environmentsFor debugging in ASP.NET and other server environments, you can run the Remote Debugging Monitor as a Windows service (the Remote Debugger Service).
To configure the Remote Debugging Monitor as a service, follow these steps:
- Click Start, click
Microsoft Visual Studio 2005, point to Visual Studio Tools, and then click Visual Studio 2005 Remote Debugger Configuration Wizard.
- Follow the steps in the wizard to set up remote debugging as a service.
How to set up the environment for remote debugging
Add the appropriate user to the Debugger Users group on the remote computerTo do this, follow these steps:
- On the remote computer, right-click My Computer, and then click Manage.
- Under Computer Management, expand
System Tools, expand Local Users and Groups, and then expand Groups.
- Double-click Debugger Users.
- To add the appropriate user to the Debugger Users group, click Add in the Debugger Users Properties dialog box.
- In the Select Users, Computers, or Groupsdialog box, enter the appropriate user in the
Enter the object names to select box, and then click
OK two times. For example, enter Domain1\User1.
- Exit the Computer Management tool.
The following table shows what accounts can access the computer.
|Computer setup||Local System account||Domain account||Local accounts with the same user name and password on both computers|
|Both computers on the same domain||Yes||Yes||Yes|
|Both computers on domains with two-way trust||No||No||Yes|
|One or both computers on a workgroup||No||No||Yes|
|Computers on different domains||No||No||Yes|
Make sure that the Visual Studio 2005 remote debugging components are installed on the remote serverIf you don't want to run Msvsmon.exe from a remote share, you have to install the remote debugging components. To install the remote debugging components, follow these steps:
- Insert the last Visual Studio 2005 CD into the remote computer. For example, if your copy of Visual Studio 2005 came on four CDs, insert the fourth CD into the remote computer.
- Navigate to the Remote Debugger folder on the CD.
- The Remote Debugger folder contains a subfolder for every processor architecture, that is, x86, x64, and IA-64 (supported SKUs only). Open the subfolder that matches the processor of your computer.
- Start Rdbgsetup.exe, and then follow the instructions to complete the setup.
Enable remote debugging on the remote serverTo enable remote debugging on the remote server, you can do one of the following:
- Install the Remote Debugging Monitor on the remote server from the Visual Studio 2005 CD. To do this, follow these steps:
- Manually start Msvsmon.exe from the local file system when you start debugging. You can stop the process when you are finished debugging.
- Start the Visual Studio 2005 Remote Debugger Service (Msvsmon.exe running as a service). By default, the service is disabled. You need to use the Services Microsoft Management Console (MMC) snap-in to enable and to start the service. Once the service is started, you can automatically debug ASP.NET applications.
- Run Msvsmon.exe remotely from a share. By sharing out the Remote Debugging Components directory on the Visual Studio 2005 computer, you can run Msvsmon.exe on the remote server without installing anything on the server.
- Install path\Microsoft Visual Studio 8\Common7\IDE\Remote Debugger\x86
- Install path\Microsoft Visual Studio 8\Common7\IDE\Remote Debugger\x64
- Install path\Microsoft Visual Studio 8\Common7\IDE\Remote Debugger\ia64
The Msvsmon.exe.config file needs to match the version of the common language runtime (CLR). The CLR version is version 2.0.50727 if you installed a Visual Studio 2005 service pack.
The following debugger features will not work when you run Msvsmon.exe from a share:
- Debugging on a computer that is running Microsoft Windows Millennium Edition or Microsoft Windows 98
- Stepping into an XML Web service (Manual attach is still possible.)
- Automatic debugging of an ASP.NET Web application or an ATL Server-based Internet Server API (ISAPI) extension (Again, manual attach is still possible.)
Build a Web solutionTo do this, follow these steps:
- Click Start, point to All Programs, point to Microsoft Visual Studio 2005, and then click Microsoft Visual Studio 2005.
- On the File menu, point to New, and then click Web Site.
- In the New Web Site dialog box, click
ASP.NET Web Site under Visual Web Developer installed templates.
- In the Location box, click
- For the location, enter a path on the remote server. For example, enter http://RemoteServerName/WebApplicationName.
Note Make sure that the FrontPage Server Extensions from Microsoft are installed on the remote server. If you don't have the FrontPage Server Extensions installed on the remote server, you receive the following error message:
- Open Default.aspx in the designer view.
- Double-click the designer to open the Code Editor. You are placed in the Page_Load event.
- Add the following line of code to the Page_Load event.
' Visual Basic
- Press F9 on the current line to set a breakpoint.
Verify that remote debugging worksTo verify that remote debugging works, press F5 to run the application in debug mode. The debugger should break at the line where you placed the breakpoint.
When you start debugging, the Remote Debugging Monitor looks like the following on the remote server:
This tells us that the user is connected to debug the application.
If the breakpoint is not hit, then we should consider looking at the Microsoft Internet Information Services (IIS) logs. The IIS logs will help you determine which step isn't working or whether the DEBUG verb is being sent to the Web server. The IIS logs are in the following location:
%windir%\system32\logfiles\w3svcNumberNote Number is the IIS instance number of the Web site.
Tip You can also click Start, click
Run, and then type LogFiles to go to the default log file directory.
You can get the path by checking the IIS properties:
- Start IIS Manager.
- Right-click the Web site you are creating projects against, and then click Properties.
- On the Web Site tab, click
Properties under Enable Logging.
The log file path and the directory are listed at the bottom of the General Properties tab.
#Software: Microsoft Internet Information Services 5.1If you don't find the DEBUG verb sent to the server that is running IIS, grab the following DEBUG verb log to get more information about what exactly is failing:
#Date: 2006-09-11 14:32:56
#Fields: time c-ip cs-method cs-uri-stem sc-status
14:32:56 X.X.X.X POST /remoteApp/_vti_bin/_vti_aut/author.dll 200
Look for the debug verb after the IP address (in our case it's X.X.X.X). This indicates that the debug verb is sent to the Web server successfully.
14:32:58 X.X.X.X DEBUG /remoteApp/Default.aspx 200
14:33:02 X.X.X.X GET /remoteApp/Default.aspx 200
14:33:05 X.X.X.X DEBUG /remoteApp/Default.aspx 200
%TMP%\Visual Studio Web Debugger.log
Things to do before you implement remote debugging
- You must reference the remote computer by using a computer name instead of an IP address.
- The Web.config file for the ASP.NET application must not contain any errors, and the compilation element must have the debug attribute set to True.
- At a minimum, the Visual Studio 2005 remote debugging components must be installed on the remote computer unless you want to run Msvsmon.exe from a remote share.
Note Make sure that you share out the Program Files\Microsoft Visual Studio 8\Common7\IDE\Remote Debugger directory and not just the subfolders within it. For example, if you share just the x86 folder and then you run Msvsmon.exe from a remote share without having the remote debugging components installed, you receive the following error message:
- Make sure that a firewall is not blocking remote debugging. If you enable a firewall and if it's blocking the execution, you receive the following error message:
- The security setting for the site must allow Integrated Windows authentication. The site may also allow anonymous access.
- Make sure that the Remote Debugging Monitor is running on the remote server. If Msvsmon.exe is not running, you receive the following error message:
Remote debugging errors and troubleshooting
How to specify a .NET Framework version for debugging
How to specify a .NET Framework version for debugging
908099 How to turn on remote debugging for Visual Studio 2005 in Windows XP with Service Pack 2
919823 You may receive an error message when you try to connect to an instance of the Remote Debugging Monitor in Visual Studio 2005
948040 Problems when trying to set up remote debug across network domainsAs always, feel free to submit ideas on topics you want addressed in future columns or in the Knowledge Base using the
Ask For It form.
Article ID: 910448 - Last Review: Jul 14, 2008 - Revision: 1