First, delete the `instance.cfg` file from the following directory: `/opt/splunkforwarder/etc` After deleting the file, restart the Splunk Universal Forwarder . If the forwarder still does not appear in the Deployment Server after the restart, perform the following checks: If your environment consists of a large or complex network, verify the MTU (Maximum Transmission Unit) configuration across the network path. Based on experience, there is a high likelihood that the issue is caused by an MTU mismatch or an incorrect MTU configuration within the network.
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