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This article is obsolete: SmartFTP automatically sends an explicit command AUTH SSL and AUTH TLS to the FTP server to initiate a secure control connection.

Old Article:

If you encounter connection issues to the AT&T web server (upload.att.net), which are related to the "AUTH TLS" command, please try the following workaround.

To enable "AUTH SSL":
Navigate to Tools > Settings > SSL and set the "Auth Mode" to "SSL".