Hello Andy,

If you are behind a router then you have to switch to passive mode. This
means that the FTP server will listen on another port for the data
transfer and the client will then connect to that port. In normal mode
the client will listen on another port but blocked by the router.

Rgds, Wilfried [TeamICS]

Friday, February 8, 2008, 12:29, info2004 wrote:

> Hi,

> Allowing port 21 through my router when using TFTPClient caused a data error
> when attempting to send a file.

> Allowing port 20 cured this.

> Sniffing the net showed that 22 has worked in some cases. Also, there is a
> difference between active and passive in terms of the extra port used.

> Can TFTPClient just use the one port? I am sure that I normally only need to
> open port 21 at the router for things like CuteFTP.

> ...Andy

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