Plesk 11.x / Linux :: Fail2ban Not Working With Http-get-dos Rule

I have fail2ban and try to install http-get-dos rule. but I have no way to make it work.

Here are my files :

# cat /etc/fail2ban/filter.d/http-get-dos.local
[Definition]
failregex = ^<HOST>.*"GET
ignoreregex =

[Code] ....

Then, when I start fail2ban, I have this thing :

2015-03-24 00:33:25,473 fail2ban.jail [7070]: INFO Creating new jail 'http-get-dos'
2015-03-24 00:33:25,473 fail2ban.jail [7070]: INFO Jail 'http-get-dos' uses Gamin
2015-03-24 00:33:25,474 fail2ban.jail [7070]: INFO Initiated 'gamin' backend
2015-03-24 00:33:25,475 fail2ban.filter [7070]: INFO Added logfile = /var/www/vhosts/mydomain1/logs/access_log
2015-03-24 00:33:25,476 fail2ban.filter [7070]: INFO Added logfile = /var/www/vhosts/mydomain2/logs/access_log

[Code] ....

So, I do not understand where is coming from the set max... then, in my iptables, I have all the Chains, but not the http-get-dos one :

# iptables -L | grep Chain | grep dos

and finally, I made some stress test, geneating more than 5000hits in 5 min, and no luck, nothing.

If I run failregex :

# fail2ban-regex /var/www/vhosts/mydomain1/logs/access_log /etc/fail2ban/filter.d/http-get-dos.local

Running tests
=============
Use failregex file : /etc/fail2ban/filter.d/http-get-dos.local
Use log file : /var/www/vhosts/mydomain1/logs/access_log

Results
=======
Failregex: 55044 total
|- #) [# of hits] regular expression
| 1) [55044] ^<HOST>.*"GET
`-

Ignoreregex: 0 total

Date template hits:
|- [# of hits] date format
| [55429] Day/MONTH/Year:Hour:Minute:Second
`-

Lines: 55429 lines, 0 ignored, 55044 matched, 385 missed
Missed line(s): too many to print. Use --print-all-missed to print all 385 lines

Did I miss something in fail2ban configuration ? is there any pb to add custom rule to fail2ban in plesk ?