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The Outlook/OWA client is unable to communicate with the Enterprise Vault server that archives the mailbox. This can occur if the client is external and a connection to the Enterprise Vault server cannot be established. This issue has also been seen if the Enterprise Vault server is not configured to use SSL.

• If external, ensure that the Enterprise Vault server can be reached either with a direct connection or via a proxy, (Netscaler), etc.
• Ensure that IIS on the Enterprise Vault server that archives the mailbox having connectivity issues is configured to use SSL and has an appropriate certificate installed that the workstation trust.
• Note: Enterprise Vault itself does not need to be configured to use SSL.

Applies To

Exchange 2019/Exchange SE