If you may get an error in Apache2 AH01630 : client denied by server configuration, you need to check in your Apache error log file.

Note : Also make ensure whether the Firewall is disabled or give firewall condition,

So, If you have installed XAMPP (lampp) in default path /opt/lampp

# tail -f /opt/lampp/log/error_log

Wed May 07 12:17:15.345747 2015] [authz_core:error] [pid 6954] [client 192.168.1.32:46332] AH01630: client denied by server configuration: /opt/lampp/htdocs/xampp/
[Wed May 07 12:17:42.244833 2015] [authz_core:error] [pid 6919] [client 192.168.1.32:46337] AH01630: client denied by server configuration: /opt/lampp/htdocs/xampp/
[Wed May 07 12:17:48.776941 2015] [authz_core:error] [pid 6920] [client 192.168.1.32:46339] AH01630: client denied by server configuration: /opt/lampp/phpmyadmin/
[Wed May 07 12:18:19.929553 2015] [authz_core:error] [pid 6954] [client 192.168.1.32:46343] AH01630: client denied by server configuration: /opt/lampp/phpmyadmin/


You need to give permission based on client hostname, IP address, and other characteristics , open the apache configuration file and add below lines,

Apache : 2.2 configuration:


Order allow,deny
Allow from all


Apache : 2.4 configuration:

Require all granted

or

 Require local
 Require ip 10.0.0.1

 
# vim /opt/lampp/apache2/conf/httpd.conf


<LocationMatch "^/(?i:(?:xampp|security|licenses|phpmyadmin|webalizer|server-status|server-info))">
Require local
Require ip 192.168.1.11
ErrorDocument 403 /error/XAMPP_FORBIDDEN.html.var
</LocationMatch>

or

<LocationMatch "^/(?i:(?:xampp|security|licenses|phpmyadmin|webalizer|server-status|server-info))">
Require all granted
ErrorDocument 403 /error/XAMPP_FORBIDDEN.html.var
</LocationMatch>

Finally, restart your LAMPP services,
 
# /opt/lampp/lampp restart