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API gateway with Oauth2 fails to connect to Keycloak on public IP

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Summary:

API GW throws error when fetching Oauth2 discovery URL:

"Unexpected response from the discovery endpoint uri: https://.../auth/realms/master/.well-known/openid-configuration. Make sure that the URI is accessible on the subnet of the gateway. Contact Oracle Support if the issue persists."

Content (required):

I have setup an API gateway in OCI and was able to make a call to a back-end API through it.

I then wanted to add Oauth2 authentication using a Keycloak service on a public IP, but the API GW fails to fetch the discovery URL (see error msg. above).

I see a similar issue when I configure a back-end API on a public IP (and with no authentication). The GW also cannot connect to the back-end on the public IP.

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