[Zope] SiteAccess problem

Hello all after careful reading of all the how-to on how to hide Zope behind Apache, I was trying to apply it. I am running Zope 2.3.1b So I have set up properly Apache 1.3.17, and placed a folder to start testing. I add the SiteAccess, I place the parameters... pluff, Zope throws an exception and tells me that it can't find the document. I will recap: say w.x.y.200 mapped to "vzope". So I add a SiteRoot object and set the base to http://vzope. After this, from manage I can't access the folder anymore. Where am I making the mistake? Thanks Stefano