This message might appear if the LDAP Store closes its connection on its side. As per
design, Policy Server needs the LDAP Store's connections to be readily
available. Policy Server won't end any connection that the backend
LDAP Store closes. When the Policy Server then tries to use such a
closed connection, the Policy Server will report LDAP error 81. Straight
after, Policy Server will also close this connection and establish a
new one with the same backend LDAP Store. As such, the LDAP Store shouldn't
close any connection for timeout or other reason.