Jetpack connection problem

Hi

Please help me. I instaled Jetpack but it doesnt work :/ Show from few days the same:
“WordPress.com is currently having problems and is unable to fuel up your Jetpack. Please try again later.
Error Details: 504″

I tried all things listed down – installed again, off other plugin, tried on Twenty Sixteen, and so on:

Jetpack Debugging Center
Testing your site’s compatibility with Jetpack…

There seems to be a problem with your site’s ability to communicate with Jetpack!

Your site isn’t reaching the Jetpack servers.
It looks like your site can not communicate properly with Jetpack.
Problemy z Jetpack?

It may be caused by one of these issues, which you can diagnose yourself:

A known issue. Some themes and plugins have known conflicts with Jetpack – check the list. (You can also browse the Jetpack support pages or Jetpack support forum to see if others have experienced and solved the problem.)
An incompatible plugin. Find out by disabling all plugins except Jetpack. If the problem persists, it’s not a plugin issue. If the problem is solved, turn your plugins on one by one until the problem pops up again – there’s the culprit! Let us know, and we’ll try to help.
A theme conflict. If your problem isn’t known or caused by a plugin, try activating Twenty Sixteen (the default WordPress theme). If this solves the problem, something in your theme is probably broken – let the theme’s author know.
A problem with your XMLRPC file. Load your XMLRPC file. It should say “XML-RPC server accepts POST requests only.” on a line by itself.
– If it’s not by itself, a theme or plugin is displaying extra characters. Try steps 2 and 3.
– If you get a 404 message, contact your web host. Their security may block XMLRPC.

https://wordpress.org/plugins/jetpack/