Not Acceptable
An appropriate representation of the requested resource /billing/index.php could not be found on this server.

Getting that error , when i am configing Client Exec .

It has some thing to do with mod_security , this has been happening a lot .

What would client exec be trying to access ? i just need to find out what it is trying to access so i can stop mod_Security from causing this error.

Thanks

Sorry ! , Fixed it :)

but how ? :D

What you should do is look at the logs of mod_security and it will tell you the problem, such as:

tail /usr/local/apache/logs/audit_log -n 200 , or wherever your log file is.
Then you can modify the mod_security configurations in your httpd.conf. - restart apache