Designate a Site Concentrator (Optional)

The Site Concentrator reduces external network traffic by downloading and caching the files requested by various features to a centralized cache location. These may include Patch Management patches, or simply the feature installations files themselves. The Agents on the network then retrieve the required files from the Site Concentrator cache, ensuring that each file is downloaded only once.

By default, the Site Concentrator installs to "C:\Program Files (x86)\Advanced Monitoring Agent\concentrator\cache". It uses port "8123" for local network connections. Both configurable when setting up or editing the Site Concentrator, and runs as a Windows service (Advanced Monitoring Agent Site Concentrator).

As the Site Concentrator acts as a caching proxy, it caches HTTP response documents and honors any cache-control, pragma or expires headers. Please note that SSL responses are never cached.

Where the response document does not contain any cache-control, pragma or expired headers then it is stored for 1800 seconds (the default cache interval) with expired documents automatically deleted every 30 seconds.

Files downloaded to the Site Concentrator that do not have a cache-control header are stored for 28-days then automatically deleted by the cleanup after this period once they are classed as expired. If an item contains a cache-control header, the item expired in accordance with this header, even if this is longer than 28-days.

Setup the Site Concentrator

  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) click Edit Site
  4. Choose Site Concentrator
  5. Populate the required information

    Device

    Select the server to install the Site Concentrator on

    Port

    The port that other devices on the network will connect through to retrieve files from the concentrator. By default this is port 8123

    Ensure all computers at the selected Site can reach the Site Concentrator over the specified port to retrieve the downloaded files. Where a firewall is running on the server or network it may be necessary to add an allow rule to permit the Agents to connect to the Site Concentrator over this port.

    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

    By default, the Site Concentrator will cache patch installation files for thirty days in a sub-directory of the Advanced Monitoring Agent installation folder (normally C:\Program Files\Advanced Monitoring Agent).

    Tick this option and then specify an alternative drive from the Cache Drive drop-down and enter the path to use in the Cache Path field.

    Please note that you will need sufficient free space (we recommend at least 2GB) on the drive where the Site Concentrator is to cache patch installation files.

    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 only apply to Site Concentrator traffic. They do not influence the traffic flows for Agent uploads and downloads.

    Upstream Proxy Port

    The upstream proxy's port

    Proxy Requires Authentication

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

  6. Click Save to apply

After submitting the dialog, the updated configuration settings are distributed to all Windows Monitoring Agents under this Site the next time they check in and the repository folder created on the selected Site Concentrator Device.

Edit or remove Site Concentrator

  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) choose Edit Site
  4. Go to Site Concentrator
    • 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.
  5. Click Save to apply

Any Site Concentrator configuration changes are distributed to all Devices under that Site the next time their Agent checks in.

Where the Site Concentrator Device changes or is removed, this is communicated to the Device previously assigned as the Site Concentrator and its cache folder deleted.

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

Upgrade to 9.8.2 Site Concentrator

As the 9.8.2 and earlier version of the Site Concentrator are incompatible, when upgrading to Monitoring Agent 9.8.2 or later we remove the previous Site Concentrator and its cache folder.

We then create a replacement cache folder using the default location or "Specific Cache Path" (where configured) with any required files re-downloaded.