denyhosts-python2.3 is not installable anymore because of the python2.4 transition. This has been resolved in debian in a newer version of the package:
denyhosts (2.5-1) unstable; urgency=low
[ Marco Bertorello ]
* New upstream release (Closes: #377469)
* Switch to cdbs build system
* From now patches are handled with dpatch
* Build-Depend on dpatch
* New python policy (Closes: #361085, #380770)
* Modified init script to call the upstream one
* Moved private python modules under /usr/share/denyhosts to not
pollute the python sys.path namespace.
* Included FAQ.html as documentation
* Added logrotate script (thanks to Jesse Norell)
* Included README.Debian that explains how to make denyhosts working
with bastilla (thanks to Jesse Norell).
* Depends on lsb-base 3.1-10, prevoius versions are buggy
(Closes: #372090)
* Moved python from Build-Depends-Indep to Build-Depends line. Thaks
to Marc Dequènes (Duck)
[ Marco Nenciarini ]
* Removed all files from denyhosts-python* and denyhosts-common
packages. All functionality are now in denyhosts package.
* denyhosts-python2.3, denyhosts-python2.4 and denyhosts-common are now
empty transitional packages.
* Switch debhelper compat level to 5
* Added myself to Uploaders field
Attaching diffstat