If the private key is protected with a passphrase, the

server will prompt for the passphrase and will not start until it has

been entered.

Using a passphrase also disables the ability to change the server's SSL

configuration without a server restart.

Using a passphrase by default disables the ability to change the server's

SSL configuration without a server restart, but see <xref

linkend="guc-ssl-passphrase-command-supports-reload"/>.

Furthermore, passphrase-protected private keys cannot be used at all

on Windows.

</para>