I know there are several other mentions of this issue floating around on the internet but I believe I have tried all of the proposed solutions.
I'm running Zenoss 4.2.4 on CEntOS 6.4, everything had been working fine until I shut down the server last night to replace a noisy fan. This morning when logging in I noticed that none of the monitored devices have any data in the graphs since the shutdown. All of the services are running. I've done the rebuild of the catalog and the reindex and it doesn't seem to have helped. Looking in zenperfsnmp.log I see:
2013-07-29 10:10:20,547 INFO zen.maintenance: Performing periodic maintenance
2013-07-29 10:10:20,547 INFO zen.zenperfsnmp: Counter eventCount, value 57441
2013-07-29 10:10:20,548 INFO zen.zenperfsnmp: 4 devices processed (679 datapoints)
2013-07-29 10:10:20,548 INFO zen.collector.scheduler: Tasks: 5 Successful_Runs: 16 Failed_Runs: 0 Missed_Runs: 0 Queued_Tasks: 0 Running_Tasks: 0
2013-07-29 10:15:20,558 INFO zen.maintenance: Performing periodic maintenance
2013-07-29 10:15:20,558 INFO zen.zenperfsnmp: Counter eventCount, value 57488
2013-07-29 10:15:20,559 INFO zen.zenperfsnmp: 4 devices processed (841 datapoints)
2013-07-29 10:15:20,559 INFO zen.collector.scheduler: Tasks: 5 Successful_Runs: 20 Failed_Runs: 0 Missed_Runs: 0 Queued_Tasks: 0 Running_Tasks: 0
Any thoughts?