eBay is up and running.
Quite often with the error page you received, it is between your pc and your server, your server and eBays server. very rarely will everyone get that error.
Try: re-booting your pc.
It is amazing how that can fix things. We get so complacent about shutting down our pc's, and doing necessary maitenance, that we forget that when a computer works, it just tosses everything into the backseat and lets it pile up.
No order to it at all, until we shut down.
Try that, then get back.