Why can only a few hundred LDAP users login at a RHEL system with sssd?

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Issue

We have come across a limitation with sssd and the number of open file descriptors, the limit is set to 1024 on sssd-1.5 based packages. This leads to only a few hundred users whose objects sssd accesses via LDAP are able to login at the same time.

Environment

Red Hat Enterprise Linux (RHEL) 6, minor release 2 and earlier
LDAP environment providing user objects

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