Server connection not working - It is not possible to connect to the server at this time

Hi,
it's been over 48 hours and I can't connect to my server via web browser. This is the only way I've connected to the server and now it's not working.
The message that pops-up is:
It is not possible to connect to the server at this time
Please, help.

Do you have access via ssh or command line?

If not, it would be really difficult to debug this problem