[Zope] domain wildcards

I am using Zope 2.4.3, and I'm trying to set up domain authentication. I made sure that setDomainAuthentication is set to 1, and I am able to supply full domain names (e.g. 192.168.0.34). However, when I use a wildcard, such as 192.168.0.*, I get an "illegal domain specification" error. Even if I set a full domain name, the authentication does not seem to work. Did anybody else run into this problem? Thanks, Philipp