Recommended FTP Client Settings

Updated 1 month ago by James Dunn

The following settings are recommended for optimal file transfer performance on our platform and will help to mitigate any transient errors without manual intervention:

  • Timeout: 300 seconds
  • Retries: 5
  • Delay: 90 seconds

The delay allows failover to occur if an individual server host is not responding for any reason. The system is self-healing and can detect these issues and will spin up a new host and direct new requests to it instead.

Failover will not work correctly if using a hard-coded IP Address instead of a domain name.

Most FTP clients will have these settings, and command line automations can be scripted to loop and wait. In FileZilla the settings can be found in the menu FileZilla > Settings > Connection as shown below.

FTP Client Timeout Settings in FileZilla
  • Active vs. Passive mode: Passive mode

Passive mode sends each file through its own channel and is more performant when sending multiple files.

FTP Client Passive Mode Settings in FileZilla
  • Keep-alives are not needed unless your FTP client is aborting file transfers due to the control channel being closed when idle. Most FTP clients do not need this.
  • Simultaneous transfers: 10

Each user is permitted to upload and/or download up to 10 files at the same time. It is also the maximum supported by FileZilla. Transfers beyond 10 are placed into a first-in, first-out queue on the client side.

FTP Client Concurrent Transfers Setting in FileZilla
If you are experiencing intermittent transfer errors, reducing this value may help.
  • ASCII vs. Binary mode: Binary mode
FTP Binary Mode Setting in FileZilla

No matter the file extension or mime-type, all files are stored exactly as they are when uploaded, byte for byte. You can compare the MD5 checksum on both sides to verify that no corruption of data has taken place.

Systems that depend on ASCII mode support are unfortunately incompatible.
  • Logging: Enabled with timestamps

This is to aid in troubleshooting and with filing a support ticket.

FTP Client Log Settings in FileZilla


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