The RPC server is unavailable - Windows 7 firewall

Problem:

Users are getting "The RPC server is unavailable"  when trying to connect to a new node in the Management View. 

Cause:

The Windows 7 firewall is blocking incoming DCOM packets.

Resolution:

Disable the firewall.  Or, add an exception in the firewall.

Here are the steps to add a fire wall exception:

1. In your search box type "wf.msc",  this will open the Windows Firewall settings.
2. On the tree in the left panel,  click on "inbound rules".
3. In the inbound rules find and enable the 2 rules named "Windows Management Instrumentation (DCOM-In)".
4. On the tree in the left panel, right click on "inbound rules" and select "New Rule...".
5. On the rule type,  Select the "Program" radio button and hit "Next...".  
6. On the Program Page, Hit the "Browse...",  navigate to C:\Program Files (x86)\StorageCraft\ShadowProtect",  select "ShadowProtectSvc.exe".  Click OK, and then Next
7. On the Action Page, select the "Allow the connection" radio button (default setting).  Click Next.
8. On the Profile Page, select all of the check boxes. (default settings)
9. On the Name Page,  Type "ShadowProtect Service" in the name box.
10. Click Finish to close the wizard.

Go back to the management view on the other machine, and attempt to connect.