Help Center/ Server Migration Service/ FAQs/ Known Errors and Solutions/ SMS.3804 The Connection to the Port 22 of Target Server Failed Due to Invalid Connection Credential

Updated on 2025-07-30 GMT+08:00

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SMS.3804 The Connection to the Port 22 of Target Server Failed Due to Invalid Connection Credential

During a migration, an SSH connection must be established between the source server and the target server. This error message is displayed when the SSH client reports the error "AuthenticationException" indicating that the identity authentication fails. Check whether the target server runs Windows and uses a key for login. If it does, use another cloud server as the target server and then try again.

Such Windows servers cannot be used as target servers for migration.

Parent Topic: Known Errors and Solutions

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