If your data collector service will not start, check the uptime.log file for an error similar to:
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xxx.xxx.xxx.xxx: is not a trusted ip
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xxx:xxx:000:xxx:xxx:0X0x:x000: is not a trusted ip
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This is usually caused by a change in the uptime.conf file related to the trustedIpAddresses variable. If changes have been made to this parameter, it is advisable to revert back so it reads as follows:
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trustedIpAddresses=0.0.0.0/0
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Once this change has been made, restart the data collector:
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Unix: # /etc/init.d/uptime_core start
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Windows: > net start "up.time data collector"