The "session" setting on cookie lifetime causes infinite redirect loop in instead of actual session cookie when user not authenticated

Problem/Motivation

If the cookie lifetime is set to session (-1) at /admin/config/people/ldap/authenication

and the end user doesn't authenticate successfully (e.g. ldap server is down), an infinite redirect is caused.

Same issue as #2001466: LDAP SSO: Session timeout is immediate instead of session cookie, causing infinite redirect loop →

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes