Asp.net configuration-solution to failure to find this page

Yesterday, ASP. net1.1 was uninstalled to maintain a consistent environment with the customer. After the test, a problem occurred while re-installing. "This page cannot be found ".

Based on my previous experience, I will start from the following aspects.
1> because Asp.net 2.0 is available on the same fashion on my machine, 2.0 and 1.1 cannot share the same application pool. create an application pool named ASP. net2.0 is used to configure 2.0 applications and set all 2.0 programs to ASP. use defaultapppool for net2.0. after the settings are complete, it cannot be found.

2> after the above method fails, I think it should be a cache problem. This time I am wrong again and clear IIS cache. the netweb cache cannot solve the problem after the w3wp.exe process restarts IIS. very depressing...

3> the problem was not found after you re-checked the NTFS permission settings IIS and configured the mime settings. It was very angry and decided not to watch nbalivestream.
4> the Rockets beat the Lakers by 1.1 to. I suddenly remembered that "Web service expansion" was not handled. Open IIS and check that the Asp.net extension was not enabled. Finally, I found the reason.

I decided to write down this problem and I will not be able to make such a low-level mistake any more in the future.