Website is going offline after 10 sec.

Hello guys,

I´ve just installed Moto without any Problems.
But after that I can connect to my Website for like 10 Seconds - than it´s down. Whenever I restard the Webserver, I can access to the Site again - but only for 10 Seconds again.

Other Files/Websites on the Webserver works, it´s only Moto which is "Going down".

Any Ideas?...