What does the FTP log say?
Is it an FTP site, or SFTP? 11.12 had changes to the SFTP and SSL code which might be related, but the FTP code was largely unchanged.
What does the FTP log say?
Is it an FTP site, or SFTP? 11.12 had changes to the SFTP and SSL code which might be related, but the FTP code was largely unchanged.