The following was [added in Feb 2020 as a workaround fix](https://github.com/oauth2-proxy/oauth2-proxy/pull/400) for Go DNS logic: https://github.com/oauth2-proxy/oauth2-proxy/blob/52ad31752d0d0b38673d419e56ddfc4cb2f56857/Dockerfile#L48 https://github.com/oauth2-proxy/oauth2-proxy/blob/52ad31752d0d0b38673d419e56ddfc4cb2f56857/nsswitch.conf#L1 --- That concern was [resolved with Go 1.16](https://github.com/golang/go/commit/c80022204e8fc36ec487888d471de27a5ea47e17) (_released in Feb 2021_). If you need more info / proof that it's no longer necessary, [see this comment](https://github.com/ory/hydra/issues/3685#issuecomment-1871576282).