ORA-12530, TNS:listener: rate limit reached

Summary:

How do I trouble shoot this error ?

Content (please ensure you mask any confidential information):

I observe this error in following configuration

Automomous database is Free Tier / Always Free ( 23ai) + Network ACLs enabled

Custom ORDS 24.1 ( connecting via Wallet ) + HTTPS ( certificate )

NB

local/default ORDS on ADB-S seems fine i.e. https://{fqdn}.oraclecloudapps.com/ords/r/{apex_user}/transaction-matching-sandbox/home is fine

NB I can login to database via sql developer and sqlcl (with and without wallet).

Oddly, if I wait, it has been known to resolve itself - but this is unpredicatable.

( If does start working, restarting ORDS is guaranteed to cause error )