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This article addresses the issue where a newly-added ICMP node is not collecting availability data.
The following error may also appear in the Collector logs:
ERROR SolarWinds.Collector.Scheduler.ScheduledTask - CheckConfigManager threw an exception.
System.ArgumentException: An item with the same key has already been added.
This can be resolved by upgrading to a new version of NPM. If you are unable to upgrade NPM, download and apply NPM 10.7 HotFix 9 from the SolarWinds Customer Portal.