In Application and Content Networking Software (ACNS) 5.x.x, the root
Content Engine (CE) can be configured to fetch with HTTP or FTP from the origin
server. This document discusses some caveats regarding the FTP server
Technical Tips Conventions for more information on document
Can the CE fetch content via FTP from any FTP server?
A. No. The FTP server software must support either:
The reason for this is that the ACNS acquirer needs to know the
last-modify time and file size before it can download the file. Currently, ACNS
uses MDTM if the FTP server supports it; if not supported, ACNS uses the
LIST command on the file. If both are not supported,
fetching via FTP fails.
Which FTP servers have been tested and work with ACNS?
A. These have been tested with ACNS 5.x.x software:
Note: Within ACNS, the acquirer tries PASV first. If the server responds
with an error or not-implement, ACNS uses PORT mode. The acquirer does support
active mode (PORT) if the PASV command is not supported by the server. If the
server hangs on the PASV command however, FTP fails
and never attempts PORT mode.