problems after moving websites to new server

HI Guys,
i was moving 2 websites to another new server with the migration tool of ispconfig.
the server is setup completely new today.
1 is liveact-international.com
when i check in the browser i see the index.html which is produced when i setup a new webspace with ispconfig.
the new ip is: 144.91.80.244 but there is no index.html in the web folder. As well the letsencrypt certificate is not valid which i moved as well with the domain.
2. domain is wp-fit.com
as well here i see the index.html but there is no index.html in the web directory of the domain.

Code:

tomdf@server6:/var/www/wp-fit.com/web$ ls
index.php        wp-blog-header.php    wp-includes        wp-signup.php
license.txt      wp-comments-post.php  wp-links-opml.php  wp-trackback.php
readme.html      wp-config-sample.php  wp-load.php        xmlrpc.php
stats            wp-config.php         wp-login.php
wp-activate.php  wp-content            wp-mail.php
wp-admin         wp-cron.php           wp-settings.php

i changed the ip of the domains today, so maybe this cause a problem? i dont understand why i see an index.html which does not exist.
maybe you can give me some help?

 

thanks for your answer.
You are right wp-fit.com is forwarded to liveact-international.com so it seems that there is no valid ssl certificate.
I just moved both domains with the certificate to the new server so the letsencrypt should work from my point of view. in the settings of ispconfig there is the box SSL and letsencrypt checked in the domain wp-fit.com
Can this be a problem because of cloudflare?
thanks for your ideas what to do

 

thanks a lot for your help.
Can you recommend an alternative to cloudflare which works good with lets encrypt? I need cloudflare because of the google speed insight

 

thanks so much for your help today