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DataDirect Connect Drivers : Sybase Driver : Connection Properties : ServicePrincipalName
  
ServicePrincipalName
Purpose
Specifies the service principal name to be used by the driver for Kerberos authentication. For Sybase, the service principal name is the name of a server that is configured in your Sybase interfaces file.
If you set this property, you also must set the value of the AuthenticationMethod property to Kerberos. When Kerberos authentication is not used, this property is ignored.
Valid Values
string
where:
string
is a valid service principal name. This name is case-sensitive.
The value can include the Kerberos realm name, but it is optional. If you do not specify the Kerberos realm name, the driver uses the default Kerberos realm.
Example
If the service principal name, including Kerberos realm name, is server/sybase125ase1@XYZ.COM and the default realm is XYZ.COM, values for this property are:

server/sybase125ase1@XYZ.COM
or

server/sybase125ase1
Default
None
Data Type
String
See also
Performance Considerations