I've tried to register an alternative server in connectivity global setting but it doesn't work.
Some details about the configuration :
master server
piB+
raspbian
armel 0.51.1
printer connected and working
2 users defined
slave server
virtual machine on a dell r610
ubuntu
amd64 0.51.1
no printer defined
no user defined
When I upload a gcode file it is processed by the pi, not by the slave server.
A wget <slave server ip>:<slave server port> on master server command line gives the landing page.
No relevant info in log file on master server.
Had missed something ?