# v4.4.17

## Enhancements

- Remove the error logs from the listeners with `Proxy Protocol` enabled when receiving TCP port probes [emqx/esockd#172](https://github.com/emqx/esockd/pull/172).

  Before this change, if the listener has enabled the Proxy Protocol (`listener.tcp.external.proxy_protocol=on`),
  and if the connection get disconnected right after the TCP handshake is completed and before the ProxyInfo is received, the following error log will be printed:
  ```
  [error] supervisor: 'esockd_connection_sup - <0.3265.0>', errorContext: connection_shutdown, reason: {recv_proxy_info_error,tcp_closed}, offender:
  ```
  After this change, no logs will be printed, but you can still view the statistics of error causes by using the `emqx_ctl listeners` command.

- Improve the logs when the listener experiences file descriptor exhaustion errors [emqx/esockd#173](https://github.com/emqx/esockd/pull/173).
  Previous log messages:
  ```
  [error] Accept error on 0.0.0.0:1883: emfile
  ```
  Log messages after this change:
  ```
  [error] Accept error on 0.0.0.0:1883: EMFILE (Too many open files)
  ```

- Improve the performance of the rule engine when there are many rules [#10283](https://github.com/emqx/emqx/pull/10283)
  Before this change, when there were many rules, the execution of the rule engine became a bottleneck, it consumed a lot of CPU time on rule queries and matches.
  In this optimization, the efficiency of rule execution in this scenario was greatly improved by simply adding a cache to the rule list.
  In our tests (with over 700 rules), the rule engine achieved a performance improvement of about 5 times after applying this optimization.

## Bug fixes

- Fix that `Erlang distribution` can't use TLS [#9981](https://github.com/emqx/emqx/pull/9981).
  About `Erlang distribution`, See [here](https://www.emqx.io/docs/en/v4.4/advanced/cluster.html#distributed-erlang) for details.

- Fixed MQTT bridge TLS connection could not verify wildcard certificate from peer [#10094](https://github.com/emqx/emqx/pull/10094).

- Fixed the problem that EMQX could not timely clear the disconnected MQTT connection information due to a large number of retained messages [#10189](https://github.com/emqx/emqx/pull/10189).
  Before this fix, the `emqx_retainer` plugin and the connection cleanup process of emqx shared the same process pool.
  Therefore, if the process pool was blocked by a large number of retain messages, many disconnected MQTT connections would not be cleaned up in time.
  For more details, see [#9409](https://github.com/emqx/emqx/issues/9409).
  In this fix, we created a separate process pool for the `emqx_retainer` plugin to avoid this problem.

- Fixed the error in the template file path of Helm Chart.[#10229](https://github.com/emqx/emqx/pull/10229)