could not open socket

when i register in vanilla shows the recaptcha error message > could not open socket. I embed the vanilla forum in my website. I earn recaptcha key for my main domain.Is this is the reason for the error??? That is www.example.com
is my domain and access vanilla through www.example.com/forum.
Do i earn separate recaptcha key for www.example.com/forum.
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Comments
you need some some server requirements
fsockets
andallow_url_fopen
to be On.grep is your friend.
how can i solve it?