I think this may be related to bug 479490. It'd be nice to have proper iptables unit with fail2ban. Reproducible: Always
Maybe the URL field isn't very visible, see discussion at https://github.com/fail2ban/fail2ban/pull/224#issuecomment-31603855
https://github.com/fail2ban/fail2ban/releases/tag/0.8.12 has been released 5 days ago.
As noted on the fail2ban-users mailing list, the patch in the URL should probably be included.
0.8.12 was handled in bug #499802.
0.9.0 is in the tree. Thanks for the report!
*** Bug 507208 has been marked as a duplicate of this bug. ***