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This article provides information on how to fix issue occurring after upgrading Additional Polling Engine (APE) to the version with Core 2015.1.3. The issue may occur as well for older versions of Core. Upon checking on Polling Engines view the Additional Polling Engine is marked as down and version of Core services does not match the on on Primary Polling Engine (PPE)
Orion Platform 2015.1.3 (NPM 11.5.3, NCM 7.4.1)
The issue is caused by missing or miss-configured components (i.e. Module Engine) on the Additional Polling Engine.
Solution 1 (preferred):