Reasons why php database cannot be connected

Various business systems will encounter some problems during use. One of them is the inability to log in to the management software due to database connection failure. This is a very troublesome and common problem

Cause 1: The login account, password, server name, and database name are incorrectly logged in and the connection cannot be connected. This is relatively common. Carefully check whether the information filled in is correct. If it is filled in correctly, it can usually be solved.

Reason two: If the SQL server is not installed correctly, the database connection will not be able to be connected; after installing the database, if the SQL service manager is not started, you need to go to the service to start it.

Cause three: The database cannot be connected due to permission issues. The solution is to detect the security protection restrictions of the computer, SQL Server security settings, and operating system security restrictions.

Cause 4: Cause: There is a fault in the network connection.

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