If you run the help command, a special issuer, plain, will be assigned to the admin gate, using login name hello and password world.
"Issuers" : {
"plain" : {
"Default" : true,
"Credential" : ["login", "passwd"],
"Provider_pars": {"Def_login":"hello", "Def_password":"world"}
}
}
The default login and password strings are defined in Def_login and Def_password in Provider_pars. You may change them.