Tips

Zimbra Outlook Connector (Failed to establish a secure connection to server ‘‘ because its security certificate is defective)

Symptoms

When trying to add a mail profile in Windows using the Zimbra Outlook Connector, you see the error: Failed to establish a secure connection to server ” because its security certificate is defective.

Cause

This warning is due to the Zimbra server using self-signed certificates which are deemed invalid by the Windows system.

Resolution

This is a known issue affecting Zimbra Collaboration Server and Zimbra Outlook Connector versions 7.2.2 and 8.0.x.

Edit the registry on an existing install

Note:
This procedure modifies the Windows registry. Before making any registry
modifications, ensure that you have a current and valid backup of the
registry and the virtual machine. For more information on backing up and
restoring the registry, see the Microsoft article 136393.

To edit the registry on an existing install to allow invalid certificates:

  1. Take a full backup of the registry prior to editing it. Do not skip this step.
  2. Click Start > Run, type regedit, and press Enter. The Registry Editor window opens.
  3. Modify this registry entry:
    • For 32-bit systems:

      [DWORD]HKEY_LOCAL_MACHINESOFTWAREZimbraAllowInvalidCerts = 1

    • For 64-bit systems:

      [DWORD]HKEY_LOCAL_MACHINESOFTWAREWow6432NodeZimbraAllowInvalidCerts = 1

  
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