Currently all eBay servers are down worldwide. Interestingly enough they can still be accessed from mobile devices. eBay is aware of an issue but as of so far hasn't said anything else.
https://www.facebook.com/eBay
Weren't they just hit a couple months ago?We are aware that some users may be experiencing problems when signing in to the eBay Site. We’re doing everything we can to resolve this and apologize for any inconvenience to our users.