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...and installation) trying to load the driver: [root@cura etc]# /usr/local/ups/bin/upsdrvctl start Network UPS Tools - UPS driver controller 2.0.3 Network UPS Tools - MGE UPS SYSTEMS/SHUT driver 0.65 (2.0.3) No communication with UPS Driver failed to start (exit status=1) I tested the cable with a polymeter and is ok and appear to be in this schema: http://www.networkupstools.org/cables/mgeups.html I don't know how to test the comunication between the pc and the ups and see if its ok or not. Could anybody help me please? Is very important to have ups working in this pc. Thanks