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When the message queue reaches its limit, the MQ software sends any new messages to a file (.mq) in C:\Windows\System32\MSMQ\Storage Directory. Files accumulate until the directory exceeds its limit (1GB by default), at which point MSMQ cannot process messages, and SolarWinds products begin to fail in their attempts to poll managed nodes. Polling errors would be recorded in the polling controller log file.
To prevent your system from reaching the MSMQ storage limit:
2012-01-22 14:28:13,143  ERROR SolarWinds.Collector.PollingController.JobSchedulerEventsService - Error processing job System.Messaging.MessageQueueException: Insufficient resources to perform operation. at System.Messaging.MessageQueue.SendInternal(Object obj, MessageQueueTransaction internalTransaction, MessageQueueTransactionType transactionType) at System.Messaging.MessageQueue.Send(Object obj) at SolarWinds.Collector.Queue.MsmqQueueController.Send(PropertyBag bag) at SolarWinds.Collector.PollingController.JobSchedulerEventsService.ProcessJobResult(FinishedJobInfo jobResult) at SolarWinds.Collector.PollingController.JobSchedulerEventsService.OnJobFinished(FinishedJobInfo jobFinishedInfo) Application Event log started throwing the following error at 7:29am on the 21st, Machine MSMQ storage quota was exceeded or there is insufficient disk space. No more messages can be stored in user queues. You can increase Message Queuing storage quota or purge unneeded messages by using Computer Management console. This event is logged at most once per 3600 seconds. To change this setting, set \HKLM\Software\Microsoft\MSMQ\Parameters\Event2183 registry value to desired time in seconds.
Note: This solution is only a stop-gap measure for handling a system resource issue. You will need to perform a capacity audit of your system to decide what components need to be augmented.