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After Cisco Unity 4.x is installed on the MCS Server with the Platform Configuration Disc, the Cisco Unity server fails to join the domain, and the "The following error occurred attempting to join the domain : No mapping between account names and security
After Cisco Unity 4.x is installed on the Media Convergence Server (MCS) 7825-H2 with the EDCS-501261DVD REV17 Part # 80-8469-01 Platform Configuration Disc, the newly installed Cisco Unity server fails to join the domain, and the No mapping between account names and security IDs was done error message appears.
The Cisco Unity server can ping both the Domain Controller and Domain Name System (DNS) server, and name resolution works fine. A reboot of the Cisco Unity does not help, and if any other server is added to the domain, there are no issues. That server successfully joins the domain.