IO Error - what does this mean?

[BeckyKey]

I did a quick check on https://validator.w3.org

I got this error IO Error -

java.security.cert.CertificateException: Certificates do not conform to algorithm constraints

What does this mean?

[Dalessi]

Hi, it is hard to tell because I do not know the URL of the site so cant look at anything really. It appears to be a security certificate error and may have to do with an SSL Handshake Exception.

I would ask the developer to make sure that the Certificate and everything on the site is set correctly to use the certificate.

Here is a link to a Stackoverflow.com article on that error message. If you go a Google search for that error it can be caused by many different things I hope this helps.

Best Regards