If you experience trouble submitting cert chains to flimsy.ct.nordu.net
(also running on port 443 now, but with separate cert) that might have
to do with recently deployed code.
In particular, I saw sha1=B34A9FEB01A2B96ED34696F2EB116C54A1EF175C being
rejected because of unknown root cert. Not sure that was you though.
I have sha1 57840546CE5D94F1AF24DFC7B62C935FB3EA873B for the root cert
you sent me some time back. Is this the only root you're using?