Problem installing plugins by wp admin

Hi, i have some issues trying to upgrade wordpress or installing plugins.
I Dont have a error code or something, just that:
“An error has occurred. It can happen something with ww.wp.xz.cn or configuration of this server. If you continue to have problems, please try to resolve them in the support forums.”

I dont know what can do, and i need to upgrade and install some plugins by the admin panel.

Thanks, greetings from Chile.