Try visiting about:config and temporarily toggle security.ssl3.dhe_rsa_aes_128_sha and security.ssl3.dhe_rsa_aes_256_sha to false-- that got me to a portal that was causing the same issue. Then after you get online you can set them back to true.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1485020 Title: firefox 40 shows a non-overrideable security error when talking to a captive portal Status in firefox package in Ubuntu: New Bug description: When trying to connect to the airport wifi at the Portland Airport (https://flypdxconnect.portofportland.com:8443/guestportal/gateway?sessionId=eb0a3d0a003315a2c104ce55&portal=LOC1&action=cwa), firefox presents me with a non-overrideable security error: Secure Connection Failed An error occurred during a connection to flypdxconnect.portofportland.com:8443. SSL received a weak ephemeral Diffie-Hellman key in Server Key Exchange handshake message. (Error code: ssl_error_weak_server_ephemeral_dh_key) The page you are trying to view cannot be shown because the authenticity of the received data could not be verified. Please contact the website owners to inform them of this problem. When the user is behind a captive portal and talking to that portal is the only way to get Internet access, it is not acceptable to enforce an SSL security policy where the user has no way of overriding it, no way of fixing the server, and no reason to care about the security of the connection to this server. As a workaround for this issue, I ran chrome. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1485020/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
