ASP. NET versions are not 1.1, and 2.0 is the same.

Follow these steps:

1. Check whether version 1.1 is installed. Check the path c: \ winnt \ Microsoft. NET \ framework \ v1.1.4322.

2. As many people know, If you reinstall aspnet_regiis and how to install it, I will not say much about it. There are a lot of Internet resources!

3. Restart IIS and restart ASP. NET.Program

4. if your web server uses a fixed IP Address: Make sure that "Default web site" is used in your "Internet Information Service" and the IP address in its attribute is "(all are not allocated) instead of the specified IP address. You can modify the name of the "Default web site", but do not delete it. Once deleted, the name can be restored as long as it is strictly "Default web site" when it is created.

5. If your IE uses a proxy, check the bypass proxy server for local adresses.

6. If you already have a Web site, uninstall it without re-installing vs.net. You only need to reinstall IIS.

7. If the problem persists, there is no way to fix it. Reload IIS, framwork,. net, and the operating system.

Finally, let's talk about a security problem. Try not to point IIS to the default path c: \ Inetpub \ wwwroot, which is very vulnerable to attacks. It is best to point it back to a new path, and then delete the wwwroot folder. If you need to upload files, you must stop uploading ". "HTA" file to grant Website access permissions, block and execute the HTA file, and back up the database!

It is also a bit of work experience for your reference, less detours!

It is indeed a bug.

1. your web server uses a fixed IP Address: Make sure that "Default web site" is used in your "Internet Information Service" and the IP address in its attribute is "(all unallocated )", instead of the IP address you have specified. Then try again in vs. Net, which may solve the problem.
2. When the above method cannot solve the problem, consider the solution in msdn as follows:
Visual Studio. NET cannot determine whether ASP. NET 1.1 runs on the Web server computer. This error may occur in several different situations. Check whether the following conditions exist:
A. Make sure that. NET Framework 1.1 is installed on the Web server computer. For more information, see Visual Studio. NET software requirements.
B. If ASP. net has been installed on the Web server computer but still encounters this error, it may be a configuration problem. To correct problematic installation or configuration, you can use the ASP. NET utility named aspnet_regiis. You can find this command line utility in a path similar to the following:
C: \ windows \ Microsoft. NET \ framework \ v1.1.nnnn \
NNNN indicates four internal versions. Search for the maximum version number. Use the/I switch to run the utility:
Aspnet_regiis/I
Prompt that you can open the command window directly from the correct directory of the command. From the "Start" menu of windows, point to "program", "Visual Studio. NET 2003", "Visual Studio. NET tool", and select "Visual Studio. NET command prompt ". After the window opens, type aspnet_regiis/I.

No. In the vs.net command prompt of the vs.net tool of the program
Input:
Aspnet_regiis-R

The problem can be solved.
Take a closer look at the significance of the aspnet_regiis parameter.
Query parameter aspnet_regiis/all
All parameters are listed.