Cloudflare temporary error codes

[evanchaney]

In the last week DNS resolution through DNSCrypt has been intermittently failing. When the issue occurs one or more domains (but not all domains) will result in DNS requests timing out.

Example:

ec-home:~ evan$ dig 6e223.playfabapi.com
; <<>> DiG 9.10.6 <<>> 6e223.playfabapi.com
;; global options: +cmd
;; connection timed out; no servers could be reached

When this happens I see error messages in syslog about Cloudflare returning an error:

Jun 23 14:17:48 vpn dnscrypt-proxy[26331]: Server [cloudflare] returned temporary error code [2] -- Upstream server may be experiencing connectivity issues

Are these error codes documented anywhere?

Adding a second resolver (Quad9) resolved the timeouts for now, but I’d like to understand what’s happening with Cloudflare so I can address it (if possible).