http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
lists port 8080 as an anternate HTTP server, bt notes of 8000 that
"8000 is sometimes erroneously used instead of port 8080"
http://www.iana.org/assignments/port-numbers
lists for port 8000:
irdmi 8000/tcp iRDMI
irdmi 8000/udp iRDMI
# Gil Shafriri <shafriri&ilccm1.iil.intel.com>
(RDM = Remote desktop method)
but of port 8080 lists:
http-alt 8080/udp HTTP Alternate (see port 80)
# Stephen Casner <casner&precpt.com>
To me, it seems Sage is an HTTP server., so should be on port 8080 and
not 8000 by default.
With company firewalls often restricting ports, I think its far more
likely port 8080 will be permitted than port 8000.
Dave