Update - We are aware that, following our resolution announce, there were spare cases where the domain name certificate was issued with delay with respect to the original expectations, or was not issued at all. After a deeper investigation, we observed that today's revocation of a set of SSL certificates uncovered a possible new integration issue between Let's Encrypt and CloudFlare systems. Specifically, customers using proxy services to route their links traffic might be experiencing additional issues at getting their https redirection working again without warnings. We have observed that disablling the active proxy, or alternatively degrading the communication protocol from HTTPS to HTTP for the channel between the Proxy and the Host (Rebrandly) helped exiting this scenario. We will investigate this specific regression outside of the context of this incident.
Oct 14, 19:48 UTC

Update - We are continuing to monitor for any further issues.
Oct 14, 11:48 UTC

Update - HTTPS redirection for affected domain names which were registered via Rebrandly is now fully operational. Monitoring the issuance of SSL certificates for affected domain names which were connected to Rebrandly via DNS.
Oct 14, 10:36 UTC

Update - We inform you that this issue does not affected Generic short URLs redirect (links with rebrand.ly or rb.gy domain name).
Oct 13, 22:26 UTC

Update - A patch is on the go, as we re-issue the revoked SSL certificates for affected domain names. We are in touch with the Let's Encrypt team to reduce the impact of this inconvenience at the best of our possibilities.
Oct 13, 22:25 UTC