[Plugin: WP-reCAPTCHA] socket error

Hi,

I’ve just updated version captcha in a Multisite WP. All seems to work, but when I submit a comment there is an error: socket error

I couldn’t use must-plugins because it broke blogs. I install plugins and do a network activation.

Do you know why a get that error?

Thanks

http://wordpress.org/extend/plugins/wp-recaptcha/