"MDTM"

The current FTP site does not support Month-Day-Time-Marking; this means that after the file was uploaded, WS_FTP attempted to preserve the date and time, but the FTP site does not support this feature. However, the files will transfer correctly. Note that this is not a fatal error, even though it displays in red.

You can disable this option by selecting Preserve file time on upload (MDTM support required) on Site Properties > Session.