I monitor our network with PRTG Network Monitor. After recently upgrading one of our Xserves from 10.5.4 to 10.5.7 (server), its status changed in PRTG to “in alarm” and was unable to connect via SNMP to collect any data. It turns out that the default configuration of the SNMP agent changed with the 10.5.7 upgrade, tightening access restrictions for the community string “public”. The fix is fairly simple. Edit line 97 of /etc/snmp/snmpd.conf and restart the SNMP daemon to reload the config file. Continue Reading >