Our Liar Proxy hosted on OVH is currently unavailable since 01:23 UTC+1. The incident on OVH side is http://travaux.ovh.net/?do=details&id=49473& but the Strasbourg (sbg) zone seems to be having a more general issue: http://travaux.ovh.net/?do=details&id=49471
We'll update this incident in the morning. Until then, if OVH fixes the issue before that, the liar proxy should recover network access.
EDIT 11:06 UTC+1: This service is in SBG1 which is currently impacted by the fire that took place in SBG. It may take several days to come back online depending on how possible it is to order new servers at OVH. If you are a user of this service, please contact us on the support if you have any questions.