![]() ![]() Additional messages in the SQL Server error log and operating system error log may provide more detail. The operating system returned error 21 (The device is not ready.) to SQL Server during a read at offset 0x00000004e92000 in file ‘D:dataAdventureWorks.mdf’. ![]() The named instance is not correct. If SQL Server 2005 Express edition is being used, check that the server is specified in the format COMPUTERNAME\INSTANENAME. Here is the complete description of the error on the screen.For instructions on how to configure authentication in SQL Server 2005 (or higher versions) click here.Check that the username you entered exists in SQL Server and make sure that the password is correct.The specified credentials are incorrect.If a firewall is being used on the SQL Server machine make sure that it allows incoming connections and that the SQL Server port is not being blocked.Make sure that outgoing TCP connections are allowed to SQL Server.Below are the essential steps to deal with it. Firewall blocking TCP-IP connection or other related reasons. Check that it is not blocking the GFI Product from making outgoing connections to the SQL Server. No mysql server is running on the mentioned host.A local firewall such as Windows Firewall is being used:.A network firewall is preventing the connection to the SQL Server (when the network path to the SQL Server will traverse a firewall).
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