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## 6. I get a not listening on… error from upsd.

Verify your LISTEN directive. It should be one of the valid IP addresses for the computer running `upsd` (or `0.0.0.0`, which is `INADDR_ANY`), not an address for a client.

The LISTEN directive lets you pick which interface `upsd` listens on. If you are trying to limit the clients which can connect to `upsd`, you either need to use tcp-wrappers or kernel firewall rules.

This isn’t a NUT-specific limitation — it applies equally to your web server or mailer daemon.

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