Hello team

I am trying to understand how LDAP failover works and where I am in error 
in my configuration.

I am using CAS 6.6.15. I have a test Docker compose setup with a CAS and 
two LDAP servers (one "primary" and the other "secondary")

Relevant config:
cas.authn.ldap[0].ldap-url=ldap://ldap1:389 ldap://ldap2:389
cas.authn.ldap[0].connection-strategy=ACTIVE_PASSIVE

My process is as follows:

   1. Start the docker compose stack
   2. Perform an auth on CAS. I observe traffic on ldap1
   3. Inside the CAS container run route add -host <ldap1 ip> reject
   4. A telnet to ldap1 389 now returns an error as expected
   5. Perform an auth on CAS. After a few seconds I get authenticated and 
   observe traffic on ldap2
   6. Perform an auth on CAS again. This time everything happens very fast 
   with no problems. So far so good!
   7. Now for the main issue: Delete the route with route del -host <ldap1 
   ip> reject
   8. Now I can telnet to ldap1 389
   9. Yet no matter what I do, how much I wait, CAS will keep on using *only 
   ldap2*
   10. I tried setting up the cas.monitor.ldap settings, explicitly setting 
   the cas.authn.ldap[0].connect-timeout=PT5S to no avail

I seem to be stuck with failover working well when the primary LDAP server 
goes offline but not when it comes back online.

Am I missing something here?

Thanks for any help

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