Symptoms

While following the Mail Services migration guide from RHEL5 to RHEL6/RHEL7 OS, after re-registering the LDAP server, a task to reinstall openldap_server package fails with the output:

HCL err: ldap: unrecognized service

Cause

Unsatisified dependencies for the migration process:

Migration of Linux Mail Services to CentOS/RHEL 6

Resolution

  1. Install the required hotfixes per the KB article.
  2. Go to the node > Packages tab and upgrade all packages that can be upgraded.
  3. Re-run the task.

Note: if some services were migrated without the hotfixes installed, it is needed to go through all nodes and upgrade the packages on each of them.

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