<value-param>

   <name>data-min-port</name>

   <value>52000</value>

</value-param>

<value-param>

   <name>data-max-port</name>

   <value>53000</value>

</value-param>

These two parameters indicate the minimal and maximal values of the range of ports, used by the server. The usage of the additional data channel is required by the FTP - protocol, which is used to transfer the contents of files and the listing of catalogues. This range of ports should be free from listening by other server-programs.