Dear all, appologies if that has already been discussed. I am currently on travel overseas and only have a small tablet here, so my options are limited. Suddenly, our Linux Mint clients refrain from logging in users and throw a system error. I increased the log level and the relevant lines seem to be: (Sun Sep 10 03:19:09 2017) [sssd[be[pleiades.uni-wuppertal.de]]] [hbac_eval_user_element] (0x0040): Parse error on [ cn=System: Manage Host Principals+nsuniqueid=53120f31-41e811e7-b96dfa31-96759478,cn=permissions,cn=pbac,dc=pleiades,dc=uni-wuppertal,dc=de]: Malformed cache entry (Sun Sep 10 03:19:09 2017) [sssd[be[pleiades.uni-wuppertal.de]]] [hbac_ctx_to_rules] (0x0020): Could not construct e val request (Sun Sep 10 03:19:09 2017) [sssd[be[pleiades.uni-wuppertal.de]]] [ipa_hbac_evaluate_rules] (0x0020): Could not const ruct HBAC rules (Sun Sep 10 03:19:09 2017) [sssd[be[pleiades.uni-wuppertal.de]]] [be_pam_handler_callback] (0x0100): Backend returne d: (3, 4, <NULL>) [Internal Error (System error)] I tried to delete the local cache, but that had no effect. Restarting the IPA server in question also did not help. Thanks for any hint. Best regards Torsten