LDAP Authenticator Stops Working

Not sure that is an 11.1 issue, as it worked fine after upgrade (2 weeks prior to the issue starting). Basically, the login will hang for about a minute and then return “Error: Invalid credentials”. The only solution we have found is to restart the Apache Tomcat service. Once restart, we can log in for 3-5 days, then it fails again.

I posted various log errors in https://forum.xwiki.org/t/ldap-stopped-working-11-1/4583, but I'm not sure that any of them are related to this failure.