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Veeam Explorer for Microsoft Exchange: Could not establish trust relationship for the SSL/TLS secure channel

KB ID: 1686
Product: Veeam Backup & Replication
Published: 2012-11-08
Last Modified: 2025-03-13
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Challenge

When restoring items with Veeam Explorer for Microsoft Exchange or sending them as attachments, the following error occurs:

The request failed. The underlying connection was closed: could not establish trust relationship for the SSL/TLS secure channel
Error

Cause

There are two possible causes:

  • The self-signed certificate the remote server uses has not been added to the local machine's Trusted Root Certification Authorities Store.
  • The hostname or IP address used to initiate the connection to the Exchange server is not specified in the certificate.

Solution

The solution varies based on the cause:

  • Ensure that the remote server's self-signed certificate is installed into the Trusted Root Certification Authorities Store.
  • Ensure that the server name or IP address being used to connect to the mailbox server (CAS) is specified within the certificate.
cert example
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