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	2505	February 14, 2017
Problem: Apache2 Returns “Not Found” for Login Page After Certificate Renewal Community ssl , apache , problem , ucs-5 , appcenter , ucs-5-2 , curl	1	8	January 9, 2026
Problem: S4 Connector neu initialisieren Supported ucs-4 , s4-connector , problem	0	2444	January 18, 2017
Q&A: Is it enough to run samba4 joinscripts on a school server, to get all samba4 objects? Community samba-ad-dc , ucsschool , q-a	1	3	January 9, 2026
Problem: DHCP Server Does Not Start on a ucs@school Replica Server - objectClass=dhcpServer Community ucr , ucs-4 , dhcp , problem , ucs-5 , ucs-5-2	0	766	January 22, 2020
Q&A: Is Microsoft LAPS Compatible with UCS? Community q-a , ucs-5 , microsoft , laps	2	13	January 8, 2026
Problem: /boot Partition Runs Out of Space Due to Old Kernels Community kernel , boot , problem , ucs-5-2	2	20	January 7, 2026
Q&A: Which ucr variable for secure ad-connector connection via port 636 Community ssl , ad-connection , ucs-5-2	1	8	January 5, 2026
Problem: SYSVOL Synchronization Fails Between Primary and Backup DC Community problem , sysvol , netlogon , samba4 , ucs-5-2	1	16	January 2, 2026
How-to: Best Practices for Upgrading to UCS 5.2 Community update , upgrade , howto , univention-upgrade , ucs-5-2	1	34	January 2, 2026
DNS Server on DC does not resolve external name Supported ucs-4 , dns , ddos , recursive , query , ip , subnet	0	6307	January 29, 2015
Problem: DNS queries from UCS systems in different subnets are refused - allow-query-cache did not match Community dns , recursive , query , subnet , bind , problem , ucs-5-2	1	19	December 30, 2025
Problem: FreeRADIUS rewrites machine hostnames to lowercase and breaks LDAP lookups Community radius , problem , freeradius , ucs-5-2	1	22	December 20, 2025
Q&A: How can I get the schema from primary Community ldap , schema , ucs-5-2	1	12	December 17, 2025
Add Subject Alternative Names to existing Certificate Supported ucs-4 , ssl , certificates , san	0	14335	December 1, 2017
Problem: Queries in a trust relationship between UCS Samba and Microsoft Active Directory take very long Community trust , samba-ad-dc , ucs-5-2-3	1	10	December 16, 2025
Problem: Ad schemaextention for LAPS not possible Community samba , samba-ad-dc , ucs-5-2-3	1	16	December 16, 2025
Problem: univention-keycloak certificate verify failed Community problem , keycloak , ucs-5-2	1	23	December 17, 2025
Problem: Keycloak SSO login failures in UCS Community dns , sso , problem , keycloak , ucs-5-2	1	24	December 15, 2025
Problem: Wi-Fi printers fail to authenticate via FreeRADIUS after upgrade to UCS 5.2 Community ssl , radius , tls , problem , freeradius , ucs-5-2	1	20	December 15, 2025
Problem: Users Unable to Change Password After Reset Community password , problem , keycloak , ucs-5-2	2	13	December 16, 2025
Problem: Disabled Student Accounts Are Still Synced to Apple School Manager Community problem , ucs-5-0 , apple-school-manager	1	18	December 16, 2025
univention.admin.uexceptions.noLock: Could not acquire lock: The attribute 'mailPrimaryAddress' could not get locked Supported ad-connection	1	13	December 15, 2025
Problem: school replica cannot install completely from scratch Community installation , ucsschool	1	12	December 11, 2025
Problem: Office365 Connector AttributeError: 'NoneType' object has no attribute 'get' Community office-365 , problem , ucs-5-2 , ldap-cache	1	9	December 12, 2025
Problem: Unable to Modify univentionFreeAttribute via Self Service Community self-service , ldap , problem , acl , ucs-5	2	18	December 11, 2025
How-to: Copy PXE kernel and installer from ISO image or download it Community howto , ucs-5-2 , pxe	1	18	December 10, 2025
Problem: GPO Folder Remains in SysVol After Deletion Community samba , replication , problem , sysvol , ucs-5 , gpmc	1	26	December 6, 2025
Problem: Azure/Entra Not Showing Newly Created Teams From Groups Community office-365 , problem , azure , teams , entra	1	12	December 6, 2025
Problem: STATUS_ACCESS_DENIED During SMB Scan on Member Server Community samba , problem , ucs-5-2 , scanner	2	25	December 3, 2025