Hello,
Many factors can cause the issue.
Have you ever connect to SQL server using sa successfully? What
authentication mode SQL server use? To connect to SQL server using sa, it
need to use mixed mode . I suggest that you perform the following steps to
narrow down the issue:
Step 1: Restart the SQL server service. Make sure SQL server service is
running.
Step 2: Ping the SQL server machine IP address and name to check if you can
receive the reply.
Step 3: Create a new Local administrative user account. Log on the server
Locally as the new Local administrative user account. Check if you can
connect to SQL server.
Step 4: Check the SQL server error logs on your hard disk to see if there
is any errors related to the issue. By default, the SQL server error log is
located in the "C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\LOG"
folder. You can use notepad to open the log file.
Check the port SQL server is listening on.
Step 5: In the Server Configuration manager, make sure TCP/IP, Shared
memory, Named pipe are enabled under the SQL server 2005 Network
configuration. Check the TCP port and make sure it is correct. If it is a
default instance, the default port is 1433.
Check the pipe name and make sure it is correct.
If you change the configuration, you need to restart the SQL server service.
Step 6: Make sure the TCP/IP, Shared memory, Named pipe are enabled under
the SQL native client configuration.
Please let me know the detail results. I look forward to hearing from you.
Sophie Guo
Microsoft Online Partner Support
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