create trigger for restricting SSMS

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SQL-Server-2005

SQL-Server

hi to all
i want to restrict SSMS connection to my sql server
i used this query and create a table and define my vaild ip address for connecting
and query execute successfully but when i connect to my server error has been occured for this trigger

create trigger tr_logon_checkip
on all server
for logon as
begin
if is_srvrolemember('sysadmin') = 1
begin
Declare @IPAddress NVARCHAR(15)
SET @IPAddress = (SELECT EVENTDATA().value ('(/EVENT_INSTANCE/ClientHost)[1]','NVARCHAR(15)'));
if not exists
(select ip from test.dbo.ValiAddress where ip = @IPAddress)
rollback;
end;
end;

please help me.