Website not responding

My website URL is:
https://hsam.pellysoft.com.au/

What I’m seeing is:

The connection has timed out

The server at hsam.pellysoft.com.au is taking too long to respond.

The site could be temporarily unavailable or too busy. Try again in a few moments.
If you are unable to load any pages, check your computer's network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.

I’m using this software:
PHP code that I have written and Mysql

Additional information:
It was working fine yesterday, but today I get that timeout message and I dont even see the login page.
I’ve tried to use the Filemanger, but it gets locked up too.

Also when I try and use phpDesigner (FTP access), it says:
Failed
Response: 421 3900 users (the maximum) are already logged in, sorry

It worked last night.
Whats going on?

BTW when I try and go to the PHP settings, I get:
Configure php directives It appears the document root for the domain name hsam.pellysoft.com.au does not exist, please contact support 89347349288

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