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Data Center Expert loses SNMPv3 communication to APC devices when upgrading NMC to AOS v6.4.6


SNMPv3 communication between StruxureWare Data Center Expert (DCE) and APC Network Management Cards (NMC) may be lost when upgrading the NMC to version 6.4.6 while it is currently being monitored within DCE.

Product Line:
  • StruxureWare Data Center Expert (DCE)
  • APC Network Management Cards (NMC)

  • StruxureWare Data Center Expert (DCE)
  • Network Management Cards being upgrading to AOS version 6.4.6 which are also monitored by SNMPv3


Upgrading an APC device that is already monitored by SNMPv3 within DCE to AOS version 6.4.6 causes a lost communication between DCE and the NMC. This issue is caused by a problem with the SNMPv3 communication process on the NMC AOS.

Other notes:
  • Devices monitored in DCE using SNMPv1 are not affected.
  • Devices being added to a DCE server for the first time which have AOS 6.4.6 loaded are not affected.
  • Devices with AOS 6.4.6 loaded that are being re-added to a DCE server will show as a generic SNMP device. This situation requires the resolution below.


To re-establish SNMPv3 communication, it is recommended to reboot your DCE server under the file menu within the desktop client. Alternatively, you may downgrade the NMC firmware version if rebooting the DCE server is not an option.

This issue will be fixed in a future version of the NMC AOS. No additional future steps will be required by the user to prevent further SNMPv3 communication loss during the next NMC firmware upgrade.

NOTE: If you are on a version of Data Center Expert prior to 7.4.2, you will need to update a device definition file for APC devices.  For details see knowledge base FA303882.
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