- Veeam Support Knowledge Base
- Veeam Explorer for Microsoft Exchange: Could not establish trust relationship for the SSL/TLS secure channel
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
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.
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