Cisco documents that CTI/JTAPI client authentication can fail while Unified CM user login works because OpenLDAP cannot verify the LDAP server certificate; the fix is to use DNS names or set TLS_REQCERT never in /etc/openldap/ldap.conf when IP addresses are used.
Checked 2026-10-02
- Vendor
- Cisco
- Product
- Cisco Unified Communications Manager
- Subsystem
- LDAP authentication
- Deployment
- on-premises
- Region
- not restricted
- Release range
- 12.5(1) troubleshooting guide
- Checked
- 2026-10-02
Sources
- Troubleshooting Guide for Cisco Unified Communications Manager, Release 12.5(1) - Cisco Unified Communications Manager System Issues — Cisco Systems · tier 2 current vendor documentation · Open LDAP Cannot Verify the Certificate to Connect to the LDAP Server
Cite this note
APA
WarmTransfer. (2026, October 2). Troubleshooting LDAP directory sync failures in Unified CM: source note cucm-ldap-sync-troubleshooting-cti-openldap-cert. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-ldap-sync-troubleshooting-cti-openldap-cert
BibTeX
@misc{warmtransfer-claim-cucm-ldap-sync-troubleshooting-cti-openldap-cert,
title = {Troubleshooting LDAP directory sync failures in Unified CM: source note cucm-ldap-sync-troubleshooting-cti-openldap-cert},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-ldap-sync-troubleshooting-cti-openldap-cert},
note = {Source note cucm-ldap-sync-troubleshooting-cti-openldap-cert, checked 2026-10-02}
}