WordPress could not establish a secure connection to www.remarpro.com

wordpress version 4.4.1

Every where I am getting this problem like in adding new plugins,updating wordpress,rss connection with wordpress.
even I am unable to embed youtube videos check my site
direct youtube links comes.
here are errors I came across:

In plugins
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.

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/haktewd4/public_html/wp-admin/includes/plugin-install.php on line 158

In rss

RSS Error: WP HTTP Error: Failed to connect to www.remarpro.com port 80: Connection timed out

RSS Error: WP HTTP Error: Failed to connect to planet.www.remarpro.com port 443: Connection timed out

In posts

“any youtube link” fail to embed

in jatpack

Jetpack could not contact WordPress.com: register_http_request_failed. This usually means something is incorrectly configured on your web host.

Failed to connect to jetpack.wordpress.com port 80: Connection timed out

I have read many post in this forum like replacing of update.php,increasing timeout etc but my problem didn’t solved.

Now main thing is wordpress is unable to connect to www.remarpro.com
So,please help me.