Getting wrong captcha every time, even if correct captcha is provided

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What steps will reproduce the problem?
1. We have provided the private and public keys as - 
RECAPTCHA_PRIVATE_KEY =  6LctkQETAAAAAOv5iqdInemV6KNV0e9PYzqwqhnE
RECAPTCHA_PUBLIC_KEY =  6LctkQETAAAAAKG7C9ATtsNETV-wR39aTOQCVnow
2. When giving correct captcha also, it is saying wrong captcha, it was 
intermittent on Thursday 19-Mar-2015, but today it is 100% failures
3. The Integration we have done is in intranet application, hence wont be able 
to provide our URLs.

What is the expected output? What do you see instead?
Captcha validated is expected output.
We are getting invalid captcha, even with correct captcha.

What version of the product are you using? On what operating system?
reCAPTCHA API verion 2.0.
the servers are on Linux operating system, and we are testing it via 
Chrome/Firefox/IE browsers from windows machines.

Please provide any additional information below.
Please let us know if there is any validity period for the keys generated?

Original issue reported on code.google.com by megha3...@gmail.com on 23 Mar 2015 at 6:08

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Any one faced such issues,Please respond and help me out.

Original comment by megha3...@gmail.com on 23 Mar 2015 at 10:59

[GoogleCodeExporter]

Hi

I am facing the same issue when I am trying to solve CAPTCHA under non js 
(noscript tag) method.

How much ever I try, it doesnt give correct random text to solve CAPTCHA.

Original comment by smartjob...@gmail.com on 15 May 2015 at 5:59