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@@ -184,6 +184,11 @@ at startup. Since it can take minutes to generate a new `dhparam.pem`, it is do
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background. Once generation is complete, the `dhparams.pem` is saved on a persistent volume and nginx
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is reloaded. This generation process only occurs the first time you start `nginx-proxy`.
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+> COMPATIBILITY WARNING: The default generated `dhparam.pem` key is 2048 bits for A+ security. Some
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+> older clients (like Java 6 and 7) do not support DH keys with over 1024 bits. In order to support these
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+> clients, you must either provide your own `dhparam.pem`, or tell `nginx-proxy` to generate a 1024-bit
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+> key on startup by passing `-e DHPARAM_BITS=1024`.
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+
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#### Wildcard Certificates
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Wildcard certificates and keys should be named after the domain name with a `.crt` and `.key` extension.
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Steve Kamerman