Authentication checks are always done with the server's user name

so authentication methods must be configured for the

server's user name, not the client's. Because

<literal>md5</>uses the user name as salt on both the

<literal>md5</>uses the user name as salt on both the

client and server, and <literal>scram</> uses the user name as

a portion of the salt used on both the client and server,

<literal>md5</> and <literal>scram</> cannot be used with