You can try the following steps in order to resolve the issue with reaching your server.
- Check whether your WordPress has any kind of firewall or security plugin like Simple Firewall or Wordfence Security and disable them temporary during the migration
- Check .htaccess (it is placed in WordPress root directory) file and remove or comment out (#) statements like
deny from 18.104.22.168
where 22.214.171.124 is the IP address of your server. You can check what is your IP using http://www.getip.com/ or you can just open Command Prompt or Terminal and run “ping your_domain_name” and IP will be shown as an output