Hi @alidarknaster. Thanks for trying Jetpack Boost! I’m sorry to hear that you have run into issues.
The error message tells me that your web server is unable to contact the WordPress.com API servers to setup a Jetpack connection. In order to use Jetpack Boost, your web server needs to be able to make requests to https://public-api.wordpress.com .
I’m afraid I don’t know which domains are blocked from Iran. If your site is hosted in Iran, then its access to other hosts will be subject to the laws of that country.
Your web hosting provider may be blocking outgoing HTTPS connections from your site. I recommend that you contact your hosting provider to ask them if outgoing HTTPS connections are blocked, and if your site should be able to access the WordPress.com API at https://public-api.wordpress.com
Your hosting provider should also be able to assist you with whether or not the local laws in the country your site is hosted may affect its access WordPress.com