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[karyoto]

Could not open socket

[Marius]

Please post the full error. There is some restriction in your server when connecting to external apis, I need the full error to guide you.

[Marius]

Or is it this?

reCAPTCHA with PHP has a bug with the latest PHP 5.4.x (reCAPTCHA PHP version 1.11, released 2010).
The PHP bug has not been fixed as of now (Oct. 2012).

The symptom is the "Could not open socket" message
(although other problems could cause the same message, such as not being connected to the network).

The fix is to modify recaptchalib.php around line 40 as follows:

-define("RECAPTCHA_VERIFY_SERVER", "www.google.com");
+define("RECAPTCHA_VERIFY_SERVER", gethostbyname("www.google.com"))

https://groups.google.com/forum/#!searchin/recaptcha/Could$20not$20open$20socket%7Csort:relevance/recaptcha/kCdFdAyOe60/YZJO-BnUHLIJ