Renew certs fail with 429 at 20:42 GMT

Welcome to the community @awareham

There was recently a change to better manage load spikes for Let's Encrypt servers. Your ACME client should be retrying after the 429 rather than failing.

See this topic for announcement for more details:

If this doesn't help you'll need to wait for other volunteers or even LE staff as I only know as much as this announcement says.

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