Table of Contents

Port exhaustion because of NATS reconnection attempts

Affected versions

Any version of DataMiner.

Cause

When a DataMiner process connects to NATS and then gets disconnected, it enters a reconnect loop (which has no timeout) where it will attempt to reconnect. During this loop, it can occur that the NATS.Client library leaks handles, which can lead to so-called port exhaustion.

Workaround

There are several ways to recover from this issue:

  • Reboot the server.
  • Stop the DataMiner DxMs, start the NAS and NATS services, and then restart the DataMiner DxMs.
  • Restart both the separate DxMs and DataMiner in general.
  • Use the workaround mentioned under method 3 on the Troubleshoot port exhaustion issues page.

Fix

Install DataMiner 10.4.6/10.5.0.

Description

NATS is unable to start up. In the C:\Skyline DataMiner\NATS\nats-streaming-server\nats-server.log log file, you may find the following error:

STREAM: Failed to start: dial tcp 127.0.0.1:4222: bind: An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.

Following method 3 detailed on the Troubleshoot port exhaustion issues page reveals that port exhaustion has occurred.

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