MailHost fails with gaierror: [Errno 2] Temporary failure in name resolution on MacOS

Start your instance as follows:

$ /usr/libexec/StartupItemContext bin/instance start

Staying logged in over multiple browser sessions

Portal Properties -> Site Properties -> auth_cookie_length

Specifies the validity period of the login cookie.

But just make sure that credentials_cookie_auth is activated in

acl_users -> plugins -> Update credentials plugins.