This article is from the eBay FAQ, by William B. Shaw firstname.lastname@example.org with numerous contributions by others.
Probably (VBG)! EBay seems to suffer more downtime than many other large
commerce sites. Although eBay doesn't always acknowledge downtime, you can
obtain the official status of the eBay site at
Unfortunately, eBay's announcement page doesn't always provide any notice of
downtime until after the fact. In case it does, you can find it on the
announcements page at http://www2.ebay.com/aw/announce.shtml.
Otherwise, clear your cache, reboot your PC and give it another try.