redacted.redislabs.com could not be resolved (2: Server failure)

[jclusso]

We recently had an issue with our Redis provider and this error came up which caused our application to throw 500s. I'm trying to understand what could've caused this and why it raised this error. I was unable to recreate this specific error but causing similiar errors by intentionally breaking the hostname are handled fine.

2021/08/18 10:20:33 [error] 28600#28600: *11030103 lua entry thread aborted: runtime error: /usr/local/share/lua/5.1/resty/http_connect.lua:208: bad request
stack traceback:
coroutine 0:
        [C]: in function 'connect'
        /usr/local/share/lua/5.1/resty/http_connect.lua:208: in function 'connect'
        /usr/local/share/lua/5.1/resty/http.lua:913: in function 'request_uri'
        /etc/nginx/lua/bugsnag.lua:331: in function 'send_report'
        /etc/nginx/lua/bugsnag.lua:405: in function 'call'
        /etc/nginx/lua/redacted.lua:233: in main chunk, client: redacted, server: _, request: "GET[redacted] HTTP/1.1", host: "redacted"```

[jclusso]

After speaking with redis.com (previously redislabs.com) they informed me the following

With regard to Server failure, this appears to be a pass through of the DNS error code 2: Server failure via the client.

So from my understanding this should be handled the same way other errors are handled.