Hi, sorry for the double posts.
I've replied to Karen, and to Ryan, but after 1 month i still get the same error message and I cannot fix this. And I really need to connect Jetpack on my blog.
That's what I've tried.
I've deactivated all plugins, then reactivate Jetpack, or install a fresh copy, or install it from FTP, or disable W3 Cache, or contact the host guys and tell if PHP_FCGI_CHILDREN is set to one and if it is, to change it at two or more, and they replied me that they didn't change anything and everything it's ok. I've tried all these combinations and my error still persist.
Also I sent a copy to raw server acces logs and made a php file that helped you guys to sift through my PHP settings. I've been asked if the compression is enabled on the server and if it is, I will need to deactivate it, but the hosting provider told me that compression on server is disabled. I don't know what to do!
I really need an answer and a debugging because I need to run Jetpack on my site.
Please, help me. I will answer properly and as fast as possible and I will tell you everything you need to make this great plugin work again. Thanks!