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https://docs.sophos.com/nsg/sophos-firewall/19.5/Help/en-us/webhelp/onlinehelp/index.html?contextId=security-heartbeat-in-switched-network

Configure Security Heartbeat in a switched network

Learn how to configure Security Heartbeat in a switched network.

When you use a firewall rule with Block clients with no heartbeat turned on and have switches in your network, there may be a delay in accessing network resources. The issue is more likely to occur if you use LAG connections between network devices.

You must adjust the heartbeat detection delay setting using the CLI to resolve the issue.

To adjust the heartbeat delay, do as follows:

  1. Sign in to the Sophos Firewall CLI. See Accessing Command Line Console.
  2. Type 4 to select 4. Device Console.

  3. Run the following command:

    system synchronized-security delay-missing-heartbeat-detection set seconds 30

  4. Test network access for devices that use the affected firewall rule. You can increase the delay if required in increments of 15 seconds.

  5. To exit the console, run the command exit.