Designate a Site Concentrator (Optional) - Windows Only

Antivirus laboratories develop new detection methods to combat new threats. This can result in frequent virus signature definition database releases. Even multiple releases within the same day.

To ensure monitored computers are fully protected. Managed Antivirus automatically updates to the latest virus signature based on its Protection Policy schedule. Checking for updates every few hours then downloading new definitions when available.

If there are a large number of workstations or servers at a site, you can assign one as the Site Concentrator. The Site Concentrator acts as a repository for all Windows Monitoring Agents on the network. It downloads and caches files, both for Managed Antivirus and other features. This includes the initial Antivirus pattern definition file and any incremental difference updates. Once in the Site Concentrator, the other Agents on the network can retrieve the files from there. Rather than download from the internet, helping to reduce network traffic.These files are then available for twenty eight or thirty days (depending on the Site Concentrator version).


  • The Site Concentrator device requires Windows Monitoring Agent v8.8 (or later), installed in Server Mode
  • Access to all system URLs. Particularly Managed Antivirus URLs
  • Accessible from all Windows computers at the selected site over the specified port.

Setup the Site Concentrator

To designate a device as the Site Concentrator from the Dashboard.

  1. Expand the Client under the left Monitoring and Management tree
  2. Right-click on the target Site (or highlight the Site and go to Edit)
  3. Select Edit Site
  4. Go to the Site Concentrator tab
  5. Choose the device from the drop-down then populate the Site Concentrator fields


    Choose the server to install the Site Concentrator on


    Port other devices on the network will connect to when retrieving updates and patches from the concentrator. By default this is port 8123

    Open Windows Firewall

    Automatically open the local Windows Firewall on the specified port.

    Once setup, all downstream clients can use this feature without additional system configuration (supported from Windows Agent 10.5.1).

    Specify Cache Path

    Select an alternative drive and path for the Site Concentrator Directory (default is sub-folder in C:\Program Files (x86)\Advanced Monitoring Agent)

    Choose the Cache Drive from the drop-down then enter the Cache Path

    Note: Sufficient free space is required on the drive where the Site Concentrator is to cache files and we recommend at least 2GB.

    Upstream Proxy IP

    Where an upstream proxy is in use on the network, enter its IP address (supported from Windows Agent 10.5.1).

    When this setting is enabled, the Site Concentrator sends all of its traffic through the Upstream Proxy over the entered port.

    These Upstream Proxy settings are only applied to Site Concentrator traffic. They do not influence the traffic flows for Agent uploads and downloads.

    Upstream Proxy Port

    Upstream proxy's port

    Proxy Requires Authentication

    Secured environments may require an Upstream Proxy Username and Upstream Proxy Password

  6. OK to save and apply

Note: Off-site - Laptops

The Site Concentrator may not always be reachable from off-site devices. To ensure these machines always have the latest definition files regardless of location, the Managed Antivirus update behavior differs slightly between engines.

  • Bitdefender – attempts to retrieve the required files from the Site Concentrator. Where unreachable, Managed Antivirus goes direct for updates.
  • VIPRE – always goes direct for updates when laptop installation detected. Regardless of whether a Site Concentrator is in place for the Site.

Edit or remove Site Concentrator

Agents under a Site receive changes to the Site Concentrator's configuration the next time they check-in.

  1. Log into the Dashboard
  2. Expand the Client under the left Monitoring and Management tree
  3. Right-click on the target Site (or from the Edit menu)
  4. Select Edit Site
  5. Go to the Site Concentrator tab
    • Edit: make changes. Select a different Device, reconfigure the settings.
    • Remove: Choose Device: No concentrator for this site to remove the concentrator for the Site. Where selected, all devices will connect directly over the internet to the file source.
  6. Save to apply

Removing or changing the Site Concentrator deletes the previous cache directory. When making changes to the Site Concentrator, any required files will re-download.


Site Concentrator from Agent 9.8.2

Windows Monitoring Agent 9.8.2 introduced an enhanced Site Concentrator. This replaces the previous version.

By default, the Site Concentrator installs to C:\Program Files (x86)\Advanced Monitoring Agent\concentrator\cache and uses the default port 8123. Both settings are configurable when setting up or editing the Site Concentrator. This runs as the Advanced Monitoring Agent Site Concentrator Windows service

The Site Concentrator acts as a caching proxy. It caches HTTP response documents and honours any cache-control, pragma or expires headers. SSL responses are never cached.

Where the response document does not contain any cache-control, pragma or expires headers. The concentrator stores it for 1800-seconds, the default cache interval. It automatically deletes expired documents every 30-seconds.

The Site Concentrator stores downloaded files without a cache-control header for 28-days. After 28-days, the files are classed as expired and deleted by the cleanup process.

If an item contains a cache-control header. The item expired in line with this header, even if this is longer than 28-days.


Upgrade to 9.8.2 Site Concentrator

The 9.8.2 and earlier version of the Site Concentrator are incompatible. When upgrading to Monitoring Agent 9.8.2 or later. The previous Site Concentrator and its cache folder are removed. A replacement cache folder is then created using the default location or Specific Cache Path. The new concentrator then re-downloads any required files.

Managed Antivirus (Bitdefender Engine)

Bitdefender engine 6.2 introduced improvements to its Cloud Services Proxy handling to ensure it honors the Site Concentrator settings. These changes were designed to help alleviate "The connection to Cloud Services could not be established" type errors.

Troubleshoot - Summary tab

Where a Site Concentrator cannot upload due to upstream proxy issues, a message may be displayed in the Device's south pane Summary tab to help identify the issue. For example: Proxy error: Unable to connect through proxy server

9.8.2 Known Issues: XP Site Concentrator Compatibility

The following are known issues if using the Site Concentrator on a device running XP:

  • Files older than 28 days are not cleared
  • Changes to the cache path are not applied

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