Restrict connection to SQL Server By IP

Question

On a QA server I need to give access to specific login from just one IP to log to this server.

I wrote This login trigger

Create   TRIGGER tr_CheckIP ON ALL SERVER
FOR LOGON
AS
BEGIN
    DECLARE @IPAddress NVARCHAR(50) ;
    If ORIGINAL_LOGIN()='test' 

    --print ORIGINAL_LOGIN() 
    begin


    SET @IPAddress = convert(NVARCHAR(50),ConnectionProperty('client_net_address'))
    --print @IPAddress
    IF NOT EXISTS ( SELECT  IP
                    FROM    master..IPAddress
                    WHERE   IP = @IPAddress )
        BEGIN


            ROLLBACK 
        END
    End
END

However the trigger is preventing the user from log although the IP exists in the IPAddress table.

Any idea where in the problem in the trigger