CREATE TRIGGER LogonAudit

ON ALL SERVER WITH EXECUTE AS 'sa'

FOR LOGON

AS
    INSERT INTO ServerLogonLog
                        (LoginName, LoginDate, SessionID, SourceIPAddress)
    SELECT ORIGINAL_LOGIN(), GETDATE(), @@SPID, client_net_address
    FROM SYS.DM_EXEC_CONNECTIONS WHERE session_id = @@SPID;