I'm suddenly unable to connect to https://atlas.ripe.net/

When using Firefox I'm getting the error "ssl_error_no_cypher_overlap"
Whith Google Chrome: "ERR_CONNECTION_CLOSED"

I'm only able to connect With IE, providing SSLV2 is enabled in advanced options (not a good idea I presume)

NB: I'm behind a corporate proxy.

--
Gilles