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	2525	February 14, 2017
Problem: NTP Queries Fail After Upgrade to UCS 5.2 - "Request timed out" Community ucr , ntp , problem , ucs-5-2	1	8	June 12, 2026
How-to: Configuring Multi-Site Samba AD in Nubus for UCS 5.2 Community samba-ad , samba-ad-dc , ad , howto , ucs-5-2	2	20	June 10, 2026
Problem: UCS@school 5.2: User Import Fails with "May not be a Windows reserved name" Community umc , ucsschool , import , problem , ucs-5 , ucs-5-2	1	15	June 10, 2026
QA: What is the future of Open-Xchange (OX) on UCS after the end of life of OX7? Community app-center , q-a , ox , ucs-5-2	1	27	June 11, 2026
Problem: Class name normalization produces invalid trailing hyphens Community ucsschool , import	1	20	June 5, 2026
Problem: Static NFS Ports Are Not Applied After Upgrading to UCS 5.2 Community nfs , systemd , problem , ucs-5-2	1	22	June 3, 2026
Problem: UCS School Replica Nodes Generate Continuous failed.ldif Community ucsschool , ldap , failed-ldif , problem , ucs-5 , ucs-5-2	1	20	June 3, 2026
Problem: Password Synchronization Failures with the UCS AD Connector After Microsoft Security Update KB5082063 (CVE-2026-20833) Community ad-connection , windows2008 , problem , ucs-5-2 , windows2012 , windows2016 , windows2019 , windows2022 , windows2025	1	44	June 1, 2026
How-to: Best Practice - Relocating a UCS Primary Node to a New Datacenter (IP Address Change) Community howto , best-practice , ucs-5 , ucs-5-2	1	25	June 1, 2026
How-to: Enable Detailed Sieve Logging and Tracing in UCS Community mail , dovecot , howto , sieve , ucs-5-0 , ucs-5-2	1	29	May 28, 2026
Problem: Missing Portal Applications Due to Incomplete LDAP Group Membership Cache in Nubus for Kubernetes Community ldap , problem , ldapmodify , uniquemember , opendesk , nubus-for-kubernetes	1	15	May 28, 2026
Problem: Users Unable to Log In Due to LDAP Primary Replication Failure Community ldap , problem , kubernetes , kubectl , opendesk , nubus-for-kubernetes	1	18	May 28, 2026
How-to: SSSD Performance Optimization and Cache Management in UCS 5.2 Community ucr , cache , howto , ucs-5-2 , sssd	1	34	May 27, 2026
Problem: SSH Connection Failures on UCS Primary Nodes Caused by OpenSSH `MaxStartups` Limits Community ucr , problem , ssh , ucs-5-2	1	20	May 27, 2026
How-to: Best Practice: Migrating Standalone Microsoft DHCP to UCS Community dhcp , ad , howto , ucs-5-2 , microsoft	1	20	May 27, 2026
Printer: Changes to Point and Print behavior Community cups , printing , printer , printmanagement , print	2	23	May 29, 2026
Problem: Keycloak LOGIN_ERROR: username_in_use and invalid_user_credentials in Distributed LDAP Deployments Community ldap , problem , keycloak , opendesk , nubus-for-kubernetes	1	26	May 21, 2026
Problem: Kinit unable to reach any KDC in realm Community kerberos , samba , ucs-4 , problem	0	26073	April 23, 2019
How-to: Use OX Functional Accounts with Email Clients like Outlook or Thunderbird Community open-xchange , howto , thunderbird , ox , ucs-5-2	1	20	May 20, 2026
Problem: Resolving OX-Connector SOAP Connection Failures in Kubernetes OX8 Deployments Community open-xchange , problem , ox-connector , ucs-5-2 , kubernetes	1	13	May 20, 2026
Problem: Problem with User Migration: UCP-0003 Error in Open-Xchange Community mail , open-xchange , problem , ox-connector , ucs-5-2	1	16	May 20, 2026
Problem: UCS@school - Windows Clients not resolving via DNS - Missing aRecords in Samba Community windows , dns , samba-ad-dc , ucsschool , ddns , problem , ucs-5-2	2	22	May 20, 2026
Problem: ID-Connector - verify.py workgroups AttributeError Community ucsschool , problem , id-connector , ucs-5-2	1	9	May 19, 2026
Problem: Setting userAccountControl with AD Connector Community	1	17	May 18, 2026
Q&A: How can we prevent teacher class assignments from being removed during a new school year import if the school administration system does not provide class assignments? Community	1	16	May 18, 2026
Problem: UCS@school 911_ucsschool_consistency Check Fails with KeyError: 'ucsschoolSchool' Community ucsschool , checks , problem , systemdiagnose , ucs-5-0 , ucs-5-2	1	10	May 18, 2026
QA: PostgreSQL 15 Security Update (DSA-6269-1) Community postgresql , security , q-a , ucs-5-2	1	27	May 18, 2026
UCS exposure to Dirty Frag (CVE-2026-43284, CVE-2026-43500) Supported kernel , security , linux	1	93	May 8, 2026
Problem: Handle conflicting Objects in samba4 Community dns , samba-ad-dc , drs-replication	1	20	May 8, 2026