proftpd dont work

[yoohosting]

Hi all

Today I tried to connect to my FTP server for a website update but my server didn't respond...

I checked the status of the ftpserver :

[root@yoohosting /]# proftpd -n
- getaddrinfo 'yoohosting.com' error: Name or service not known
- warning: unable to determine IP address of 'yoohosting.com'
- error: no valid servers configured
- Fatal: error processing configuration file '/etc/proftpd.conf'

What can be the reason? it was working 5-6 hours ago...

 

[yoohosting]

Even a ping yoohosting.com on this server doesn't work... (YooHosting.com is the host name of the server normaly)