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<h2id="keepAlive"><ahref="#keepAlive">A note about keepAlive</a></h2>
Before Mongoose 5.2.0, you needed to enable the `keepAlive` option to initiate [TCP keepalive](https://tldp.org/HOWTO/TCP-Keepalive-HOWTO/overview.html) to prevent `"connection closed"` errors errors.
Before Mongoose 5.2.0, you needed to enable the `keepAlive` option to initiate [TCP keepalive](https://tldp.org/HOWTO/TCP-Keepalive-HOWTO/overview.html) to prevent `"connection closed"` errors.
However, `keepAlive` has been `true` by default since Mongoose 5.2.0, and the `keepAlive` is deprecated as of Mongoose 7.2.0.
Please remove `keepAlive` and `keepAliveInitialDelay` options from your Mongoose connections.