Slate 1800 " The interface is connected, but the Internet can't be accessed with IPv4 protocol. "

" The interface is connected, but the Internet can’t be accessed with IPv4 protocol."

I have received the above error several times traveling through Europe. Can someone please post a solution?

Usually this happens when there is a captive portal. After you get IP address, you don’t have Internet. You need to get authenticated via the portal then this message will disappear.