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Pairing vRealize Operations Manager 6.x with a VMware vSphere vCenter that has a weak certificate fails with the error: Certificates does not conform to algorithm constraints (2138644)

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  • When pairing a VMware vCenter Server adapter with VMware vRealize Operations manager it fails with the error:
      Certificates does not conform to algorithm constraints.
  • In the /storage/vcops/log/collector.log file, you see entries similar to:

    ERROR [Task Processor worker thread 3]  com.integrien.alive.common.adapter3.AdapterBase.onCheckCertificate - Error trying to make connection Certificates does not conform to algorithm constraints


This issue occurs when VMware vCenter Server certificate has an RSA key size lower than 1028.


This is an expected behavior in VMware vRealize Operations Manager.

To work around this issue, the RSA key size requirement needs to be lowered or disabled:

  1. Log in to the Master node as root through console or a SSH session.
  2. Open $VMWARE_JAVA_HOME/lib/security/ file using a text editor.
  3. Change this line to reduce the key restriction, or comment out the entire line to disable the restrictions:

    jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 1024

    For example:
    Reducing the key size: jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 512
    Removing restraints: #jdk.certpath.disabledAlgorithms=MD2, RSA keySize < 1024

  4. Save and close the file.
  5. Repeat steps 1-3 on each node in the cluster.
  6. Attempt to pair your vCenter Server adapter.

    Note: It may be necessary to wait for a few minutes before trying the pairing again, or restart the collector service on each node by running this command:

    service vmware-vcops restart collector

Update History

27/04/2016 - KB Published externally

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