I can connect to that one using 0.2.7.1 just fine, only some rubber tweaks are active there that 0.2.7.1 does not understand. I get tons of compatibility warning messages, of course, which is annoying, but everything seems to work fine afterwards.
If you're using something earlier, you're out of luck: CYCLE_RUBBER_SPEED has been modified, and that probably means MB wants to lock out clients with the framerate dependant rubber code bug. You can try to persuade him to set add
to the configuration, but its absense probably is intentional.