Dell PowerVault DP500 - Manual (Page 29)

Configuring DPM
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Figure 3-2. Verifying Prerequisites
After the wizard verifies your settings, it configures the Windows firewall for
DPM. In this step, the wizard will create firewall exceptions for the DPM
executables and open the TCP port for Windows Remote Procedure Call
(RPC) and Distributed COM (DCOM) (port 135). If the firewall service is
not running, this step will be skipped.