If you login, the system will redirect you to its public address. I.e., if you connected to http://localhost:3020/ it will redirect you to http://my.domain.org:3020/. This can be undesirable on e.g., a notebook that is not always connected to the internet and/or may change address and/or may be behind a firewall. You can disable redirection using the settings below. These settings may also be necessary if the server is behind a proxy.