Hi,thank's for your reply

here u can find my trigger code.

CREATE TRIGGER connection_limit_trigger

ON ALL SERVER

FOR LOGON

AS

BEGIN

IF EXISTS(SELECT * FROM sys.server_principals AS SP WHERE [name] = SUSER_SNAME() AND type_desc IN ('Windows_Login', 'Windows_Group'))

BEGIN

RAISERROR('Windows LOGIN''s are NOT allowed ON this SERVER', 16, 1)

END

END