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Error ID: 326 normally appears when the server or computer which you wanted to be protected is already being protected by another DPM server or it has “DPM 2007 Agent coordinator” already installed. Check the followings,

 
Error ID: 308 appears when Firewall application blocks the DPM Agent traffic between the Host & the Client. If you’re using the Microsoft firewall or any other firewall application in your environment, you must allow the following TCP & UDP ports to allow the communication between DPM Host & Client.
TCP Ports:
5718, 5719, 135, 88, 139, [...]