java.lang.UnsatisfiedLinkError: Native Library C:\\opt\\snaplogic\\ldlib\\sqljdbc_auth.dll already loaded in another classloader.

You have uploaded customized JDBC JAR files to the directory.

Remove all JDBC JARs from the SQL Server account and restart the JCC node.

com.microsoft.sqlserver.jdbc.SQLServerException: This driver is not configured for integrated authentication.

The correct sqljdbc_auth.dll file is not available in the ldlib folder.

Download the appropriate sqljdbc_auth.dll file  and place it in $SL_ROOT/ldlib.

No valid credentials provided
OR
Server not found in Kerberos database.

The Service Principal Name (SPN) is not setup properly.

Ensure that you have setup the SPN for MSSQLSvc service properly.

Defective token detected

Kerberos fails when a mismatch occurs between the SPN for the SQL Server service and the hostName.

For example, if FQDN of the machine is used to setup SPN, the hostName must be an FQDN and not an IP address, while establishing a connection.

Provide a value for hostName that matches with the SPN in context. Also ensure that the properties authenticationScheme, domain and integratedSecurity are defined for the account.