Seaquel
SQL Server error code

SQL Server error 9649

SQL Server raises error 9649 at severity 16, which marks a problem with the query or data that you can correct.

A security (SSPI) error occurred when connecting to another service broker: '%.*ls'. Check the operating system error log for more information.
Msg9649
Severity16
Group9000–9999

Source: Database Engine events and errors