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Home > Success Center > Network Performance Monitor (NPM) > NPM - Knowledgebase Articles > Some of the features of the polling engine not working after upgrade

Some of the features of the polling engine not working after upgrade

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Issue:

After upgrading NPM to 10.5 the following functionalities are not working on the Primary and Additional Polling Engines:

 

  • Poll Now (nodes from APE)
  • List Resources (nodes from APE)
  • Weblauncher (on APE)
  • SWQL Studio on both servers targeting remote server
  • Installation of SAM 5.0.2 (on APE)


Cause:

The root cause of it was the fact that primary server was set with daylight saving time while secondary wasn't. So in reality the ZULU time on primary was 1 hour ahead.

 

Say for example:

  • request creation time - 15:25 (primary, where request was originating from)
  • current time - 14:26 (secondary, where request was targeted)


Resolution: 

 

  • After adjusting time settings, all features previously ending with errors (listed above) started to work perfectly.
  • In multi-polling engine environments all servers have to be set up with correct time with respect to Zulu time, not only having correct clock.
  • Co-ordinated Universal Time (UTC) zone is sometimes denoted by the letter Z. Since the NATO phonetic alphabet word for Z is "Zulu", UTC is sometimes known as Zulu time.
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