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Clearly state built-in ACME no longer works (#7824)

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I'm tempted to remove this section entirely, but it's helpful for admins who are trying to figure out why their Synapse is crashing on start with ACME errors.

Signed-off-by: Luke W Faraone <luke@faraone.cc>
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Luke Faraone 2020-07-14 09:49:10 +00:00 committed by GitHub
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12
INSTALL.md
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@ -405,13 +405,11 @@ so, you will need to edit `homeserver.yaml`, as follows:
```
* You will also need to uncomment the `tls_certificate_path` and
`tls_private_key_path` lines under the `TLS` section. You can either
point these settings at an existing certificate and key, or you can
enable Synapse's built-in ACME (Let's Encrypt) support. Instructions
for having Synapse automatically provision and renew federation
certificates through ACME can be found at [ACME.md](docs/ACME.md).
Note that, as pointed out in that document, this feature will not
work with installs set up after November 2019.
`tls_private_key_path` lines under the `TLS` section. You will need to manage
provisioning of these certificates yourself — Synapse had built-in ACME
support, but the ACMEv1 protocol Synapse implements is deprecated, not
allowed by LetsEncrypt for new sites, and will break for existing sites in
late 2020. See [ACME.md](docs/ACME.md).
If you are using your own certificate, be sure to use a `.pem` file that
includes the full certificate chain including any intermediate certificates