GitHub Enterprise uses a self-signed certificate when it is first started. You should configure TLS to use a certificate that is signed by a certificate authority that is trusted by web browsers.
Uploading a custom TLS certificate
In the upper-right corner of any page, click .
In the left sidebar, click Management Console.
At the top of the Management Console, click Settings.
In the left sidebar, click Privacy.
Select SSL only (recommended).
Under "Certificate", click Choose File to choose a TLS certificate or certificate chain (in PEM format) to install. This file will usually have a .pem, .crt, or .cer extension.
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Under "Unencrypted key", click Choose File to choose a TLS key (in PEM format) to install. This file will usually have a .key extension.
Warning: Your TLS key must not have a passphrase. For more information, see "Removing the passphrase from your key file".
