sssd_be[24065]: Could not start TLS encryption. unknown error

This document (000021149) is provided subject to the disclaimer at the end of this document.


SUSE Linux Enterprise Server All Service Packs


Following message is found in journalctl

2023-06-29T07:07:17.350846+02:00 server1 sssd_be[24065]: Could not start TLS encryption. unknown error


To get more descriptive message than "unknown error" one can enable libldap debugging.
In /etc/sssd/sssd.conf under [domain/$DOMAIN] add option:
 ldap_library_debug_level = -1
and restart sssd:
systemctl restart sssd
after the error appears in journalctl, inspect /var/log/sssd/sssd_$DOMAIN.log for further details.


The message itself is harmless and might occasionally show up in journalctl.
However, if it floods the logs, it might indicate an underlying system/network problem.  
In this example case, /var/log/sssd/sssd_$DOMAIN.log shows:
(2023-07-20 11:47:25): [be[DOMAIN]] [sss_ldap_debug] (0x4000): [RID#19241] libldap: tls_read: want=5252, got=3930
(2023-07-20 11:47:25): [be[DOMAIN]] [sss_ldap_debug] (0x4000): [RID#19241] libldap: tls_read: want=1322 error=Interrupted system call
(2023-07-20 11:47:25): [be[DOMAIN]] [sss_ldap_debug] (0x4000): [RID#19241] libldap: TLS trace: SSL_connect:error in TLSv1.3 read encrypted extensions
(2023-07-20 11:47:25): [be[DOMAIN]] [sss_ldap_debug] (0x4000): [RID#19241] libldap: TLS: can't connect: .
(2023-07-20 11:47:25): [be[DOMAIN]] [sss_ldap_debug] (0x4000): [RID#19241] libldap: ldap_err2string
(2023-07-20 11:47:25): [be[DOMAIN]] [sss_ldap_init_sys_connect_done] (0x0020): [RID#19241] ldap_install_tls failed: [Connect error] [unknown error]
indicates network related problem and packets analysis is required.


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  • Document ID:000021149
  • Creation Date: 24-Jul-2023
  • Modified Date:24-Jul-2023
    • SUSE Linux Enterprise Server

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