You may receive the error "Expected another server reply (15): No such file. (2)" when trying to upload files to an SFTP server using SyncBackPro. This can occur if the SFTP server does not fully support a protocol version of SFTP (there are several protocol versions of SFTP). SyncBackPro will always use the newest protocol version that the SFTP server states it supports, and so there may be problems if the server doesn't fully support that protocol version. For example: the Titan FTP Server does not fully support version 5 and 6 of the SFTP protocol. To resolve this you should configure the SFTP server to use SFTP protocol version 3.