Error on installing plugin after import site

I’ve tried to import as said on the support page and it didn’t helped.
I’ve disabled the plugins (deleted) and tried to install a new plugin and this warning appeared:

”
Warning: An unexpected error occurred. Something may be wrong with www.ads-software.com or this server’s configuration. If you continue to have problems, please try the support forums. (WordPress could not establish a secure connection to www.ads-software.com. Please contact your server administrator.) in /var/www/html/en/wp-admin/includes/plugin-install.php on line 77
object(WP_Error)#483 (2) { [“errors”]=> array(1) { [“plugins_api_failed”]=> array(1) { [0]=> string(218) “An unexpected error occurred. Something may be wrong with www.ads-software.com or this server’s configuration. If you continue to have problems, please try the support forums.” } } [“error_data”]=> array(1) { [“plugins_api_failed”]=> string(44) “Resolving timed out after 15526 milliseconds” } }
”

Help me out to figure out what the error is about.

Thank you,
Daniel Alves