Workarounds for Unable to connect to ASP. NET Development Server

This is because the port used by the Web site to start the ASP. Development server is occupied.

Specific solutions:

1. Select the site project name in Solution Explorer and switch to the Properties window

2. In the Properties window, first change the use dynamic port under Developer Web server from True to False. Instead of false, the "port number" entry will be made editable by the original non-editable state, when the original port number is deleted, enter a different port number (note that it cannot be used as a common port, in case of being occupied again).
3, start the site debugging, return to normal. If you still cannot start, continue modifying Port 4, and then change "use dynamic port" to True

Workarounds for Unable to connect to ASP. NET Development Server