# User's Guide |

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# You receive firewall blocking messages

If you update Windows XP to the most recent software and service packs, it is likely that you've installed the Windows Firewall. You might also have another firewall program installed on your computer. Firewalls block certain types of communications between various network devices. This helps protect your data from hackers, viruses, spyware, and Trojan-horse software.

The HP Media Vault comes with software applications that must communicate over the network, but sometimes these programs are blocked, by default, by a firewall. When this happens, security alerts pop up on your screen. Security alert dialog boxes usually have a list of possible options. For example, the dialog box might ask you the following three questions:

1. Click Keep Blocking.
2. Click Unblock.
3. Defer the choice and be reminded later.

If you see a security alert dialog for an HP Media Vault application or an NTI backup application, you should unblock the communication to permit the application to run. You are safe to unblock the communications because you are not enabling any connection or communication with the Internet, only between the HP Media Vault and its software applications.

The following list comprises the software applications that need to communicate with the HP Media Vault:

- HPMVTray.exe - HP Media Vault System Tray utility
- NASSelector.exe - HP Media Vault Browse utility
- NASDriveMapper.exe - HP Media Vault Drive Mapping utility
- Cddib32.exe - NTI DriveBackup!
- Shadow.exe - NTI Shadow

If any software is reinstalled, moved to a new disk location, or if the application is deleted from the exception list using the Security Center control panel, communications between that software and the HP Media Vault may once again be blocked by the firewall.

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