Thanks!! that helped me proceed in right direction and solve the issue.

On Monday, December 21, 2015 at 9:39:55 PM UTC+5:30, LostInThe Tubez wrote:
>
> You may very well have to download the latest rule files from the github 
> repository in order to recognize the latest apache log format. You can 
> verify by copy/pasting a line from your apache log into ossec-logtest and 
> seeing if it knows how to decode it. 
>
> > -----Original Message----- 
> > From: ossec...@googlegroups.com <javascript:> [mailto:
> ossec...@googlegroups.com <javascript:>] 
> > On Behalf Of dan (ddp) 
> > Sent: Monday, December 21, 2015 5:52 AM 
> > To: ossec...@googlegroups.com <javascript:> 
> > Subject: Re: [ossec-list] ossec for apache access log on ubuntu - not 
> > generating alerts 
> > 
> > On Mon, Dec 21, 2015 at 7:40 AM, Venkata Venamma 
> > <venka...@gmail.com <javascript:>> wrote: 
> > > Hello experts, 
> > > 
> > > I want to monitor apache access.log on ubunu using ossec. Have 
> configured 
> > > local_rules.xml as below, in addition to adding the log file 
> > > /var/log/apache2/acces.log to ossec.conf file. 
> > > 
> > > Entry in local_rules.xml: 
> > > 
> > > <group>apache,</group> 
> > > </rule> 
> > >   <rule id="31101" level="10" overwrite="yes"> 
> > >     <if_sid>31100</if_sid> 
> > >     <description>Web server 400 error code.</description> 
> > >   </rule> 
> > > </group> 
> > > 
> > 
> > You're missing the "<if>^4</id>" from the rule. 
> > 
> > 
> > > 
> > > When I hit the apache server with too many not existent URLs ( this 
> forcing 
> > > too many 404 in access.log), I was expecting to receive email and 
> generate 
> > > alerts. I don't see any activity in the ossec log or alert log. 
> > > Can you please provide some pointers how to solve? 
> > > 
> > > Thanks in advance, 
> > > 
> > > -R 
> > > 
> > > 
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