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Network discovery issues in Bitdefender GravityZone

This section provides instructions for troubleshooting network discovery issues. To learn how network discovery works, refer to How network discovery works

BitdefenderGravityZone relies on multiple network scanning techniques to perform network discovery. Occasionally, network discovery might fail due to NetBIOS name resolution issues, communication problems between Bitdefender Endpoint Security Tools (BEST) and Control Center or to internal errors.


Before proceeding to troubleshooting, consider the following:

  • In complex network environments consisting of multiple workgroups and domains, it might take up to a few hours until all computers are detected and displayed in Control Center.

  • When new computers are connected to the network, they do not show up in Control Center immediately. It may take some time until new computers are identified and reported, depending on when BEST performs the network discovery.

Normally, a few minutes after installing BEST on a computer in your network, most of the computers from the client’s visibility area (workgroup, domain) should be displayed as unmanaged in Control Center, on the Computers page.

To resolve this issue, follow the steps below:

  1. Check that the client is displayed as managed computer in Control Center and that it is online. Go to the Computers page to view this information. If the client does not appear as managed computer or if it is offline for some time, you must identify and troubleshoot the condition that prevents communication between BEST and Control Center. After solving the communication problem, you must wait for about 30 minutes until network discovery is performed again.

  2. Verify the computers displayed under File Explorer > Network on the machine running network discovery. The same computer list should be available in Control Center.

    • If no computers are displayed under the Network section, check if network discovery is enabled in the Control Panel > Network and Internet > Network and Sharing Center > Change advanced sharing settings section.

    • If computers are displayed under the Network section but not present in Control Center, contact Bitdefender Enterprise Support to further investigate the matter.

  3. Make sure File sharing is enabled in the Control Panel > Network and Internet > Network and Sharing Center > Change advanced sharing settings section.

  4. Make sure the following services are running on the computer performing network discovery and the computer(s) to be discovered:

    • DNS Client

    • Function Discovery Provider Host

    • Function Discovery Resource Publication

    • HomeGroup Provider (for Windows 7)

    • SSDP Discovery

    • UPnP Device Host

  5. Make sure the client computer is in a workgroup or domain and connected to an IPv4 local network.

  6. If the computer is in a workgroup, check if there are other network computers in the same workgroup. If the computer is in a domain, check if there are other computers in the same domain and if the connection to the Active Directory server is available. You can ping the AD to perform this check.

  7. Check that the NetBIOS over TCP/IP protocol is enabled and allowed by the local firewall.

  8. Check that the network computers have a policy assigned to them in the Policies > View Policies section in the Control Center. If a policy is not assigned, create one from the Policies > Create New Policy section.

  9. Check that the computers are in the same network as the computer running network discovery.

  10. Check that media streaming is enabled.

The previous troubleshooting steps must be performed for each computer with BEST installed. Alternatively, you can check the general requirements for network discovery to work, as described hereinafter.


After installing each BEST, you might need to wait for about an hour before network discovery is performed and detected computers show up in Control Center.

If some computers have not been detected, check the following possible causes:

  • Computers directly connected to the Internet, but having no connection to the local network, will never be detected.

  • Computers in a workgroup or domain where BEST has not been installed yet will not be detected.

    • For full network visibility, BEST must be installed on at least one computer in each workgroup or domain in your network.  Ideally, BEST should be installed on at least one computer in each subnetwork.

    • To detect computers in another domain, there must be a trust relationship between domains.

  • On the computers that have not been detected, make sure the following conditions are met:

    • File sharing is enabled and allowed by the local firewall.

    • Network discovery is turned on.

    • NetBIOS over TCP/IP is enabled and allowed by the local firewall.

    • Media streaming is enabled.

    • The following services are running: DNS Client, Function Discovery Provider Host, Function Discovery Resource Publication, HomeGroup Provider (for Windows 7), SSDP Discovery, and UPnP Device Host.

If the above steps do not resolve the issue, please contact Bitdefender Enterprise Support for assistance.