In the previous page, scroll all the way to the bottom.
Set the minimum execution time to 7 seconds and the maximum execution time to 2 seconds. No, it's not a typo. By having the minimum higher than the maximum we will throttle down the archive extraction by ~70%. This will help if the server is blocking requests because they come "too fast".
If this doesn't help, you may want to temporarily rename the .htaccess file of your site. The integrated restoration feature is directly calling the administrator/components/com_akeebabackup/restore.php script. If you have a server-side protection, i.e. .htaccess rules, or permissions settings which prevent this file from being called directly the process will fail.
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!