Hi all, after a long discussion/debugging session with James it seems that mod_perl auth* directives can conflicts with other mod_auth directives.
Since this can be strictly dependent on user specific setting there is no way we can ensure that they will always work together and it seems that the problem is not related to the LoadModule order of mod_auth/mod_perl but a more generic case (at least this is what we were able to understand after our tests). The bug will be closed with the next apache upload, that contains a short summary and a reference to this bug in the README.Debian, so that these information will not be lost in time. I encourage anyone familiar to this setup to provide more information if we missed something obvious in our tests/summary. Thanks Fabio -- <user> fajita: step one <fajita> Whatever the problem, step one is always to look in the error log. <user> fajita: step two <fajita> When in danger or in doubt, step two is to scream and shout.