SuperSocket information: (SpnRegister): error 1355 in Windows™ application event log
If the SQL Server is unable to register a Service Principal Name (SPN), a
SuperSocket information: (SpnRegister): error 1355
message is thrown.
See the Microsoft Support site for information about the Warning SuperSocket
Info
warning message.
This message is not an error message. This text is only a warning that SQL Server was not able to register a Service Principal Name (SPN), which indicates that the security mechanism used is Microsoft™ Windows NT™ Challenge\Response (NTLM) authentication instead of Kerberos. CAUSE The message usually appears because the SQL Server service account is running as a domain user who does not have requisite permissions to register SPNs.