archive sidebar

Hi Our site www.toerfietsleusden.nl is live now for two days. And all the compliments for you. There are a few little problems. I used the agaros forum. That has been paced in the footer items and is accessible for users only. So far so good. Now the problem. When I click as a non member on the agars forum link, I com to a page that says that I have to login. Also good. But on that page the archive sidebar is visible. I looked at all widgets. Non has been added there. How is this possible and is there a solution for. Kind regards Hans Hagmeijer