Port 1433 of SQL Server

Have you ever encountered this problem: when you create a new SQL Server registration, you can use the user name and password to register, but in ProgramWhy does the database connection fail during access?
1. The program can access other machines. Only one machine is not allowed.
2. Use the *. udl file for testing.

Test port cmd-> Telnet 192.168.0.10 1433 to check whether the port can be activated. If the port cannot be accessed, perform the following settings:
Solution: Open the firewall and open port 1433.

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