I've been able to setup apcupsd 3.8.5-55 on two machines running in a master/slave mode off an APC SmartUPS 2200. Both of the machines have full network access to each other and are running the identical version of apcupsd but I get the follow error in the events log: Cannot read magic from slave 10.0.3.207 I have setup a usermagic string on the slave machine's config. Anyone else have any suggestions on what else I can look at? Below are my apcupsd.conf settings from both machines: Master apcupsd.conf - UPSCABLE smart UPSTYLE smartups DEVICE /dev/ttyS0 LOCKFILE /var/lock UPSCLASS netmaster UPSMODE net NETTIME 10 NETPORT 6666 SLAVE 10.0.3.207 Slave apcupsd.conf - UPSCABLE ether UPSTYLE smartups LOCKFILE /var/lock UPSCLASS netslave UPSMODE net NETPORT 6666 MASTER master.localhost.com USERMAGIC stringhere