Hi, We were running NetScaler build 13.0.47.24 with LDAPS authentication. Last week we update to build 13.0.52.25 and since then users started complaining authentication failed. The LDAP vip, with a LDAP monitor was up and healthy. Still user had to logon multiple times, before they were validated succesfully. The aaad.debug log reported "ns_ldap_setup_socket : Error connect while starting SSL connect to x.x.x.x:636". After we did a failback to 13.0.47.24 authentication worked flawless again. Next we tested with build 13.0.58.30 which also worked flawless. Didn't open a support case, but there seems to have been a issue with LDAPS on 13.0.52.25