Forum Discussion
APM Oauth client gives a HTTP 503 Service unavailable, DNS lookup failed error
Did you ever figure this out?
We're running into a similar issue where we see "HTTP error 503, DNS lookup failed" when attempting to hit an introspection service to validate an oauth token.
I'd like to read more about what this DNS Resolver actually does because from what we've seen, it's makes no difference whatsoever.
Cheers!
- boneyardOct 19, 2020
MVP
sorry no solution for initial problem, but do you see a DNS request going out of the big-ip? either via TMM or mgmt interface?
can't find a good K article on the DNS resolver configuration. i see it as a way to use different DNS servers then the one you configure for the box. also that traffic will always go via the TMM interfaces.
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