1. The cause of the error (http error 503.the service is unavailable error)
Second, find the problem
A 503 error occurs in IIS, and it is found that the DdeaultAppPool application pool automatically stops after starting .
3. Solutions
1. After opening the iis management, click Open to view the application pool . Once in the application pool, click to select Defaultapppool .
2. After clicking to select, right-click, click to open advanced settings, change " Enable 32-bit programs------True ", and change " Identification----Networkservice " in advanced settings .
3. Click OK to solve it.