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## 25. upsd is running, so why can’t I connect to it?

Assuming you haven’t changed the TCP port number on the command line or at compile-time, then you may have some sort of firewall blocking the connection.

`upsd` listens on TCP port 3493 by default. If you do not specify a `LISTEN` directive in `upsd.conf`, `upsd` only listens on the loopback interface. See the upsd.conf(5) man page for details.

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