None of the stuff I found online fixed our issue where ZCM agents were causing the logins to hang 5-10 mins. We had the registry key set for async and it was still bad. We finally simply restarted the ZCM services on the servers and then everything fixed itself and logins were back to normal, well under a minute. In our case they had to reboot the sql database in the middle of the night and I am guessing the the connectors from our zcm servers to the db were messed up.

Try it,


zcm 10.3.3
AD domain
edir ldap connector
sql db
Novell client too.