SQL remote connection timeout has reached the problem

The timeout has reached. The timeout has expired or the server has not responded before the operation is completed.

Note:An error occurred while executing the current Web request. Check the stack trace information to learn about this error andCodeDetailed information about the cause of the error.

Exception details:System. Data. sqlclient. sqlexception: the timeout has been reached. The timeout has expired or the server has not responded before the operation is completed.
 

You can use the Telnet command on the client to check whether Telnet XXX. XXX 1433 is enabled. The connection may fail because the remote listening port 1433 is not enabled or the firewall is blocked.