I saw a post about this in a different forum, but I figure this must be a common question for anyone installing SharePoint 2013 with IRM.
How do you overcome this error when enabling IRM in Central Administration?
"The required Active Directory Rights Management Service Client (MSIPC.DLL) is present but could not be configured properly. IRM will not work until the client is configured properly."
I'm testing this in a lab environment with Windows Server 2012 and AD RMS running on a separate server from the Domain Controller or the SharePoint Server.
The TechNet guidance doesn't appear to be updated for 2013 IRM yet.
Tom Resing, Microsoft Certified Master in SharePoint 2007 - http://tomresing.com