Hi Hernan,
From the TCP/IP Volume 2 User's Manual:
http://ftp1.digi.com/support/documentation/019-0144_G.pdf
Section 4.2 Configuration Macros
'The following macros are specified in HTTP.LIB. Unless otherwise noted,you can override the
default values by defining the macro (same name, different value) before you #use “http.lib”.'
...
HTTP_PORT
This macro allows the user to override the default port of 80.
Regards,
David