Knowledge Base

Supported How-tos and guides provided by the community and the Univention team. Cool Solutions Community How-tos and guides provided by the community and the Univention team.

Topic	Replies	Views	Activity
About the Knowledge Base category Knowledge Base	0	2520	February 14, 2017
Problem: UCS@school Replica Join Fails: 96univention-samba4slavepdc.inst - The relative ID (SAMBA) is already in use Community samba , ad-takeover , join , samba-ad-dc , ucsschool , problem	1	7	April 17, 2026
Problem: UCS Join Fails at 92univention-management-console-web-server.inst due to Keycloak 500 Error Community postgresql , join , saml , problem , keycloak , ucs-5-2	1	5	April 17, 2026
Problem: Notifier.log Shows Traceback Community ucs-5-2	0	713	April 25, 2019
Problem: File write failures on UCS Samba shares with “Operation not supported” errors Community samba , samba-ad-dc , problem , acl , nfsv3 , ucs-5 , ucs-5-2	1	9	April 16, 2026
QA: Why is my bind accessing root-ns server although I have forwarders? Community dns , q-a	1	12	April 16, 2026
Problem: Rejoining a UCS@school Replica Node After Accidental Removal from Domain Community udm , join , ucsschool , problem , ucs-5 , ucs-5-2	1	11	April 14, 2026
Problem: GPO Processing Errors (Event ID 1129) and Version Conflicts between AD and SYSVOL Community samba-ad , servicesforwindows , gpo , ad , problem , sysvol	1	30	April 10, 2026
Problem: Incorrect MDB Max Size Warning during upgrade to UCS 5.2 Community upgrade , problem , mdb , ucs-5 , ucs-5-2	1	15	April 10, 2026
How-to: Time Synchronisation for UCS in Virtual Environments Community virtualization , ucs-4 , ntp , time , howto , ucs-5 , ucs-5-2	0	8749	September 6, 2018
How-to: Configure OpenVPN Start Before Logon (SBL) / PLAP using OpenVPN GUI on Windows Community windows , openvpn , howto	1	34	April 9, 2026
Problem: 92univention-management-console-web-server.inst fails with Could not connect to keycloak server Community join , sso , keycloak , ucs-5-2	1	18	April 8, 2026
Problem: Resolving Kerberos Authentication Issues Between TrueNAS and UCS Domain Controllers Community freenas , ucs-5-2	1	10	April 8, 2026
QA: How can "Value incompatible" errors be resolved when setting UCR options? Community ucr , q-a , ucs-5	2	7	April 9, 2026
Problem: Home directories created on wrong server after update to UCS 5.2.5 Community samba , samba-ad-dc , problem , homedirectory , ucs-5-2	1	16	April 8, 2026
Problem: Some samba tools ignore `include local.conf` Supported samba , problem	1	7	April 7, 2026
Updating from PostgreSQL 11 to PostgreSQL 15 Supported postgresql , installation , ucs-5-0 , ucs-5-2	0	5802	October 18, 2023
Problem: VBScript Deprecation Warning (Event ID 4096) During Windows Logon Community ucsschool , problem , windows10 , vbs-script , windows11 , ucs-5-2	1	98	April 1, 2026
Problem: UCS join script 96univention-samba4.inst fails with LDAP ENTRY ALREADY EXISTS due to stale Samba objects Community samba , join , samba-ad-dc , problem , ucs-5-2	1	20	March 31, 2026
Keycloak App container fails to start wrong persistence storage version Community keycloak , ucs-5-2	1	18	March 31, 2026
Problem: Mailing Lists Created in Wrong Container Due to UMC Mail Module Behavior Community mail , problem , ucs-5-2 , mailinglist	1	15	March 26, 2026
QA: Can I allow usernames to just contain characters? Community import , q-a , user-management , ucs-5-2	1	8	March 27, 2026
Problem: Windows 10/11 Clients cannot discover UCS server via Network view Community fileshares , firewall , samba-ad-dc , problem , windows10 , windows-11	1	23	March 25, 2026
Problem: Failed to re-index objectSid - schoolserver RID conflict Community s4-connector , ucsschool , reject , ucs-5-2	1	21	March 20, 2026
Problem: 'No such attribute', 'ctrls': [], 'info': "attribute 'dBCSPwd': no such attribute for delete on <dn>" Community s4-connector , reject , ucs-5-2	1	4	March 20, 2026
Problem: Error “2 error(s) occurred” when opening self-service profile Community self-service , problem , ucs-5-2	2	3	March 20, 2026
UCS not affected by critical AppArmor vulnerability (CVE-2026-23268, CVE-2026-23269) Supported kernel , sudo , security	2	32	March 19, 2026
Problem: UCS Radius App Reinstall Fails Due to Missing proxy.conf.debian Community problem , freeradius	1	9	March 19, 2026
Problem: gpmc/mmc is crashing when delegation is used Community samba , gpo , ucs-5-2-4	1	29	March 17, 2026
Problem: Identifying and Locking User Accounts with Unchanged Initial Passwords in UCS-LDAP Community	1	20	March 16, 2026