Informationen

http://www.admin-magazin.de/Das-Heft/2013/05/Udev-mit-virtuellen-Maschinen
http://www.admin-magazin.de/Das-Heft/2013/02/Geraetenamen-herausfinden
disable firewall:
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
iptables -F

To change all the directories to 755 (-rwxr-xr-x):
find /opt/lampp/htdocs -type d -exec chmod 755 {} \;