Comment 18 for bug 997990

good news: the workaround of using libpam-cracklib really worked in ubuntu, in fedora the thing also works

the problem was that my testing machines were in a virtualbox with nat networking and in that configuration there can be some problems for making kerberos run correctly:
http://hasustorm.com/books/English/OReilly.Kerberos.The.Definitive.Guide.eBook-LiB.chm/0596004036_kerberos-chp-6-sect-5.html

when switched the network to use bridged mode the things started to work.
I'm going to take a look to the other problems found to think for a clever solution for them

thanks!!!