Answer:
First check the if the adapters on the router or site are connected (Ipconfig)
Next run a flush Dns to clear the sites dns logs (ipconfig/flushdns)
If non of that works you would run a restart on the server that is transfering data through the site.
If that doesn't work you will have to call a tech support from another company or your boss to tell him that there is nothing you can do and to ask for help!
Step-by-step explanation:
Hopefully this helps! BTW I'm 13 so I wouldn't rely on my information that is personal what I would do though.