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PR #14771 added support for getting certs from alternate ACME servers, but the certStore caching mechanism breaks unless you install the CA in system roots, because we check the validity of the cert before allowing a cache hit, which includes checking for a valid chain back to a trusted CA. For ease of testing, allow cert cache hits when the chain is unknown to avoid re-issuing the cert on every TLS request served. We will still get a cache miss when the cert has expired, as enforced by a test, and this makes it much easier to test against non-prod ACME servers compared to having to manage the installation of non-prod CAs on clients. Updates #14771 Change-Id: I74fe6593fe399bd135cc822195155e99985ec08a Signed-off-by: Tom Proctor <tomhjp@users.noreply.github.com>