Error in Admin panel

After I log in to wordpress, the dashboard and all other pages in admin view displays a warning as follows.

Warning: An unexpected error occurred. Something may be wrong with www.remarpro.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.remarpro.com. Please contact your server administrator.) in /home/xxxxxxxxx/public_html/xxxxxxxxx.in/wp-includes/update.php on line 295

Warning: An unexpected error occurred. Something may be wrong with www.remarpro.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.remarpro.com. Please contact your server administrator.) in /home/xxxxxxxxx/public_html/xxxxxxxxx.in/wp-includes/update.php on line 457

And I can’t connect to my wordpress.com account with jetpack plugin. I think these two are related.