[Tue 01 11:14:37 ] [error] [client XX.XX.XX.XX] ModSecurity: Rule execution error – PCRE limits exceeded (-8): (null). [hostname "www.domainname.com"] [uri "/client/forgot_password.php"] [unique_id "HADMQWW3LaKoLKAiYAAaAAP"]
To fix This modsecurity issue with the domain, followed the steps given below :

1) Login to the server as root.
2)Go to directory /usr/local/apache/conf
Run :
[[email protected]~]# cd /usr/local/apache/conf
3)Then Create a file “pcre_modsecurity_exceeded_limits.conf” and paste following lines in it.
Run :

[[email protected] conf]# vi pcre_modsecurity_exceeded_limits.conf Code need to be paste :

SecPcreMatchLimit 150000
SecPcreMatchLimitRecursion 150000

4) Save and quit the file.
5) Make sure that the permissions assigned for the file are 600.
Run :
[[email protected] ~]# chmod 600 /usr/local/apache/conf/pcre_modsecurity_exceeded_limits.conf
6) Now open the file /usr/local/apachec/conf/modsec2.user.conf .

[[email protected] ~]# vi /usr/local/apachec/conf/modsec2.user.conf
7) Find the line ““
8 ) Add following line just below the above mentioned line that is ““
Include “/usr/local/apache/conf/pcre_modsecurity_exceeded_limits.conf”
9)Save and quit the file.
10) Now just restart your apache and mysql service.

[[email protected] ~]# /etc/init.d/httpd restart ; /etc/init.d/mysqld restart