K2, also a new record, edit article or as a result of any action;
This site is unreachable.
The connection was reset.
ERR_CONNECTION_RESET

Coming error and white page. On the other hand Joomla's running smoothly all the components. K2 works fine on localhost.

Thank you for your help ...

www.redklaus.com

Joomla 3.4.8
K2 v2.6.9
MySQL 5.6.29
PHP Version 5.5.28

this is always? if this is when add a item with image check the folder permisions

This indicates a server side issue.
Please enable error reporting and set it to development in your site's Global Configuration to see the actual issue.