After wordpress 3.8 upgrade all is working fine, exept I can not post or update large pages on wordpress. Connection lost/reset error. It is not a browse, cache or plugin problem.
The connection was reset The connection to the server was reset while the page loads. The site could be temporarily unavailable or too busy. Please try again later; If you are unable to load any pages, check the network connection on your computer; If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.
I suggest them the solution below afer searching on google and many tests on my wordpress blog, and is is working! Whitelisted my IP address in modsecurity rules on the server.
Support Staff Response
Dear ***, Thank you for contacting Hosting Support regarding ***.com. I understand you were seeing connection reset errors when posting. We have confirmed this problem is due to modsecurity rules in place to protect the server and websites from automated attacks. The error and apache access logs won't show this issue but our admins have confirmed it and whitelisted your IP address ***. Please contact us if you have any further issues. Regards, ***. Advanced Hosting Support
I hope it will help many others peoples :)