Hi webprofusion,
on this system we’ve generated certificates for 3,681 domains this month (16 days). With about 100–150 badNonce errors during that time, we’re seeing an error rate of roughly 4%. That’s significantly higher than usual for us (<1%), which is why I wanted to check in and see if there might be any underlying issues on the Let’s Encrypt side.
As mentioned, the errors themselves are not a big problem for us — our client automatically retries, and all certificates eventually get issued successfully. My main concern is just to be sure there’s nothing unexpected happening with the LE infrastructure, especially since we’ve had a similar situation before (see here) --> cross-datacenter nonce redemption.
Thanks for your input!