SQL Server Does Not Exist or Access Denied Error

[Anuraag Sharma]

[DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied error is often experienced by users while connecting to the SQL Server. There can be several causes for the same but the most common ones are:

1. SQL Server service stopped.
2. Disabled Remote connection.
3. Unavailable SQL Server instance.
4. Blocked IP address of the instance.
5. Disabled browser service of the SQL.
6. Absence of Port in the firewall exception list.

As per Microsoft, users must use the following string to get rid of the problem:

[oledb]
; Hardcoded TCP OLE DB initstring
Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;User ID=clientID;Data Source=tcp:TcpIpAddress,port[oledb]
; Hardcoded Named Pipes OLE DB initstring
Provider=SQLOLEDB.1;Integrated Security=SSPI;Persist Security Info=False;User ID=clientID;Data Source=np:\\ServerName\pipe\MSSQL$InstanceName\sql\query

Now, if users are not proficient enough in SQL Server technicalities, they must opt for the automated solution. Here, SysTools SQL Recovery Tool is so far the best in the industry. This utility can easily help users fix corrupted SQL MDF files to get rid of such errors.