Error
The migration failed checking Source credentials. The handshake failed due to an unexpected packet format.
Answer
This error indicates that MigrationWiz is attempting to log in to an IMAP server using SSL while the server is only supporting non-SSL connections. Usually, this means that port 143 was specified, and the use secure connection (SSL) option was enabled.
Resolution
You can use either of the following options:
- Update the project to connect to the IMAP server on its SSL-enabled port (usually 993).
- Uncheck Use a secure connection (SSL).