Help Please - Service Unavailable

Getting Service Unavailable on www.birchgardencentre.co.uk. Below are the error messages. What do I need to do. Thanks in advance.

Warning: mysqli::__construct(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /home/stockpor/birchgardencentre.co.uk/app/Tygh/Backend/Database/Mysqli.php on line 40

Warning: mysqli::__construct(): (HY000/2002): php_network_getaddresses: getaddrinfo failed: Name or service not known in /home/stockpor/birchgardencentre.co.uk/app/Tygh/Backend/Database/Mysqli.php on line 40

Google "php_network_getaddresses"

Here is one of the results...

https://stackoverflow.com/questions/34266567/getting-connection-failed-php-network-getaddresses-getaddrinfo-failed-name-or/34304508

Thanks but I don't really understand haha

I had just migrated the website from one server to this one - the website was working fine on the old server. I'm 99% sure everything copied across properly?

I've fixed that bit - but still not working.

When I try to access admin it adds this to the URL https://birchgardencentre.co.uk/thisisnotmyadminlogin.php?dispatch=auth.login_form&return_url=admin.php%3Fdispatch%3Dauth.login_form%26return_url%3Dadmin.php%253Fdispatch%253Dauth.login_form%2526return_url%253Dadmin.php%25253Fdispatch%25253Dauth.login_form%252526return_url%25253Dadmin.php%2525253Fdispatch%2525253Dauth.login_form%25252526return_url%2525253Dadmin.php%252525253Fdispatch%252525253Dauth.login_form%2525252526return_url%252525253Dadmin.php%25252525253Fdispatch%25252525253Dauth.login_form%252525252526return_url%25252525253Dadmin.php%2525252525253Fdispatch%2525252525253Dauth.login_form%25252525252526return_url%2525252525253Dadmin.php%252525252525253Fdispatch%252525252525253Dauth.login_form%2525252525252526return_url%252525252525253Dadmin.php%25252525252525253Fdispatch%25252525252525253Dauth.login_form%252525252525252526return_url%25252525252525253Dadmin.php%2525252525252525253Fdispatch%2525252525252525253Dauth.login_form%25252525252525252526return_url%2525252525252525253Dadmin.php%252525252525252525253Fdispatch%252525252525252525253Dauth.login_form%2525252525252525252526return_url%252525252525252525253Dadmin.php%25252525252525252525253Fdispatch%25252525252525252525253Dauth.login_form%252525252525252525252526return_url%25252525252525252525253Dadmin.php%2525252525252525252525253Fdispatch%2525252525252525252525253Dauth.login_form%25252525252525252525252526return_url%2525252525252525252525253Dadmin.php%252525252525252525252525253Fdispatch%252525252525252525252525253Dauth.login_form%2525252525252525252525252526return_url%252525252525252525252525253Dadmin.php%25252525252525252525252525253Fdispatch%25252525252525252525252525253Dauth.login_form%252525252525252525252525252526return_url%25252525252525252525252525253Dadmin.php%2525252525252525252525252525253Fdispatch%2525252525252525252525252525253Dauth.login_form%25252525252525252525252525252526return_url%2525252525252525252525252525253Dadmin.php%252525252525252525252525252525253Fdispatch%252525252525252525252525252525253Dauth.login_form%2525252525252525252525252525252526return_url%252525252525252525252525252525253Dadmin.php%25252525252525252525252525252525253Fdispatch%25252525252525252525252525252525253Dauth.login_form%252525252525252525252525252525252526return_url%25252525252525252525252525252525253Dadmin.php

And says

This page isn’t working

birchgardencentre.co.uk redirected you too many times.

Appears to be working now. Did you delete /var/cache/?