Question

I have registered an account on recaptcha.net with mydomain.com.

While I’m developing on my localhost it works fine, but whenever I try to open the page from another machine in my local network it shows "input error: invalid referer" error message!

I’m not using recaptcha plugins.

Answer 1

reCaptcha keys are tied to a certain domain + localhost (when you got your private/public keys from them). You can use it on another domain by requesting new private/public keys or by using a global key.

From their website:

• By default, your reCAPTCHA key is restricted to the specified domain, and any subdomains for additional security. A key for foo.com works on test.foo.com.

• If you wish to use your key across a large number of domains (e.g., if you are a hosting provider, OEM, etc.), select the global key option. You may want to use a descriptive domain name such as "global-key.mycompany.com"

• If you own multiple domain names (foocars.com and footrucks.com), you can sign up for multiple keys, or use a global key.