This appears to be a harmless error thought on the archives i saw 2 people 
using debian where denyhost
did not block the attacker in my case i see discrepancies between my 
var/log/messages and denyhost log


denyhost log:
2007-07-16 17:54:50,839 - denyhosts   : ERROR    regex pattern ( User 
(?P<user>.*) not allowed because not listed in AllowUsers ) is missing 'host' 
group

line repeats 5 more times and then 

2007-07-16 17:54:50,919 - denyhosts   : INFO     new denied hosts: 
['210.13.124.20']

here is entry in /var/log/messages


Jul 16 17:54:21 pepino sshd[22196]: User nobody from 210.13.124.20 not allowed 
because not listed in AllowUsers
Jul 16 17:54:21 pepino sshd[22196]: Failed password for invalid user nobody 
from 210.13.124.20 port 34831 ssh2
Jul 16 17:54:23 pepino sshd[22198]: Invalid user patrick from 210.13.124.20
Jul 16 17:54:23 pepino sshd[22198]: Failed password for invalid user patrick 
from 210.13.124.20 port 34913 ssh2
Jul 16 17:54:26 pepino sshd[22200]: Invalid user patrick from 210.13.124.20
Jul 16 17:54:26 pepino sshd[22200]: Failed password for invalid user patrick 
from 210.13.124.20 port 34992 ssh2
Jul 16 17:54:29 pepino sshd[22202]: User root from 210.13.124.20 not allowed 
because not listed in AllowUsers
Jul 16 17:54:29 pepino sshd[22202]: Failed password for invalid user root from 
210.13.124.20 port 35074 ssh2
Jul 16 17:54:31 pepino sshd[22204]: User root from 210.13.124.20 not allowed 
because not listed in AllowUsers
Jul 16 17:54:31 pepino sshd[22204]: Failed password for invalid user root from 
210.13.124.20 port 35159 ssh2
Jul 16 17:54:34 pepino sshd[22206]: User root from 210.13.124.20 not allowed 
because not listed in AllowUsers
Jul 16 17:54:34 pepino sshd[22206]: Failed password for invalid user root from 
210.13.124.20 port 35236 ssh2
Jul 16 17:54:37 pepino sshd[22208]: User root from 210.13.124.20 not allowed 
because not listed in AllowUsers
Jul 16 17:54:37 pepino sshd[22208]: Failed password for invalid user root from 
210.13.124.20 port 35316 ssh2
Jul 16 17:54:39 pepino sshd[22210]: User root from 210.13.124.20 not allowed 
because not listed in AllowUsers
Jul 16 17:54:39 pepino sshd[22210]: Failed password for invalid user root from 
210.13.124.20 port 35399 ssh2
Jul 16 17:54:42 pepino sshd[22212]: Invalid user rolo from 210.13.124.20
Jul 16 17:54:42 pepino sshd[22212]: Failed password for invalid user rolo from 
210.13.124.20 port 35472 ssh2
Jul 16 17:54:44 pepino sshd[22214]: Invalid user iceuser from 210.13.124.20
Jul 16 17:54:44 pepino sshd[22214]: Failed password for invalid user iceuser 
from 210.13.124.20 port 35554 ssh2
Jul 16 17:54:47 pepino sshd[22216]: Invalid user horde from 210.13.124.20
Jul 16 17:54:47 pepino sshd[22216]: Failed password for invalid user horde from 
210.13.124.20 port 35631 ssh2
Jul 16 17:54:50 pepino sshd[22218]: Invalid user cyrus from 210.13.124.20  
Jul 16 17:54:50 pepino sshd[22218]: Failed password for invalid user cyrus from 
210.13.124.20 port 35714 ssh2  
Jul 16 17:54:50 pepino denyhosts: Added the following hosts to /etc/hosts.deny 
- 210.13.124.20 (unknown)
Jul 16 17:54:51 pepino clamd[3184]: SelfCheck: Database status OK.
Jul 16 17:54:52 pepino sshd[22220]: Invalid user www from 210.13.124.20
Jul 16 17:54:52 pepino sshd[22220]: Failed password for invalid user www from 
210.13.124.20 port 35785 ssh2


i also see the ip in /etc/hosts.deny.

so it appears in my case denyhost dealt with the attacker,

so what does that error mean >>>>>>   2007-07-16 17:54:50,839 - denyhosts   : 
ERROR    regex pattern ( User (?P<user>.*) not allowed because not listed in 
AllowUsers ) is missing 'host' group



thanks,

this is my second day using denyhost looked thru faq and docs and archieve and 
did not get a clear indication of what is error....



using slackware 12
OpenSSH_4.6p1, OpenSSL 0.9.8e 23 Feb 2007
Python 2.5.1



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