Migrating the site from Plone 5.1.5 to 5.2.1.Setting up an OpenLDAP 2.4.50 installation, migrating all of the ApacheDS data into it (2000 users, 500 groups), installing identical indexes, and switching Plone to use it.But Plone+Zope+ insists on opening new LDAP connections Note that there is a memcached server in use and indeed if I telnet into and check stats I see a nice constant number of objects in it. Why isn't re-using or closing these connections? If I run Plone in isolation and keep lsof -p PID running on it with a constant curl -cookie _ac="…" on the site, sure enough I see the file count rise up and up and up, especially TCP connections to my LDAP server hanging around in the ESTABLISHED state. I'm thinking the former is a red herring, and the "Too many open files" is the actual problem. The error log shows either INVALID_CREDENTIALS. These users are backed by an LDAP server (Apache DS) using I've got a Plone-5.1.5 site with 2 or 3 simultaneous users who routinely experience getting their login sessions being "kicked out" and an inability to log back in for a while.
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