I have resolved the issue and documented the resolution here: https://groups.google.com/d/msg/google-appengine/LhQ2NEydn0w/tt6v0-RzBAAJ
On Friday, February 19, 2016 at 7:42:34 AM UTC+8, DFB wrote: > > Suddenly 2 hours ago, my site became inaccessible at the custom domain > which has been working fine for years. The site is still accessible at > appspot.com . I already checked with my domain registrar and they > confirmed that everything is fine at their end. I noticed another person > raising the same issue just a while ago. So it seems like there's a problem > on the Google's side. > > Hope GAE team can help resolve the issue ASAP. The site has been > inaccessible for more than 2 hours now. > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/541cc0bc-ddce-444b-a46e-45b60c5e5d43%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
