Internal local IP is not working on Virtualbox behind NAT

Hello, I installed cPanel/WHM behind a nat, therefore I used Virtualbox in Bridge mode, then I Installed CentOS Minimal as guest, deactivated network manager, after this I installed cPanel/WHM it worked well for five days without problems, but suddenly I could not connect to my server... Now it looks like that my CentOS installed on Virtualbox is not getting any local IP adress, so a port forwarding is not possible.. My CentOS in Virtualbox should get the internal ip: 192.168.178.47 That was the local IP where I could reach cpanel over the static IP of ISP via forwarding in router (I dont want tell here my static ip of provider, which was reserverved for our company)... Our ISP gave us an external static IP and everything worked well... What happened I have really no idea but by checking my ip I see that my network has only the standard localhost IP 127.0.0.1 and the Netmask 255.0.0.0 Why my virtual network card hasnt the internal IP address, anymore?: 192.168.178.47 What could be happened, how can I fix that?