Comment # 6 on bug 971941 from Johannes Weberhofer

I guess you had modified jail.conf in your config. Line 11-13 in that file
reads:

# YOU SHOULD NOT MODIFY THIS FILE.
#
# It will probably be overwritten or improved in a distribution update.

In this case you should check the jail.conf.rpmsave file which contains your
old, modified file and see what you have changed.

Only jails enabled in jail.local are expected to work. To make e.g. the sshd
jail work you must insert this section into jail.local:

[sshd]
enabled  = true

If you need some help, please read the FAQs and prepare proper information when
you ask for support. A good point to start is here:
https://github.com/fail2ban/fail2ban