HTML5 validator.w3.org

Question

My site was valid until today, wondering wether it is my site's or the validator's fault.

I am getting this message:

The error encountered was: 500 Can't connect to localhost:8888 (connect: Connection refused)

Answer 1

I just tried to validate google.com and got the same error.

Answer 2

HTTP Error 500 is an Internal Server Error, so that will be their fault. Try validator.nu whilst you are waiting.

Answer 3

I think it's pretty clear from the error that it's a problem at their end:

Checking the Document Type of this document requires the help of an external tool which was either not enabled in this validator, or is currently unavailable. Check in the validator's system configuration that HTML5 Validator is enabled and functional. The error encountered was: 500 Can't connect to localhost:8888 (connect: Connection refused)

(My emphasis.) I expect they'll get it fixed Right Quick Like.