Python: Pyro: OpenOPC: Connection failed

Question

I'm trying to set up OpenOPC for Python in combination with Pyro. Whenever I try to connect to the OPC server I get this error:

Pyro.errors.ProtocolError: connection failed

I looked this up and it seems that Pyro is binding the server on the loopback adapter (making it invisible from the outside).

What I have tried so far:

Edit the etc/hosts file:

Changed: 
127.0.0.1         localhost  
into 
192.168.4.93      localhost

This didn't work.

Edit configuration.py from Pyro:

Changed:
'PYRO_HOST':            '',
'PYRO_PUBLISHHOST':     None,
'PYRO_NS_HOSTNAME':     None,
into
'PYRO_HOST':            '192.168.4.93',
'PYRO_PUBLISHHOST':     '192.168.4.93',
'PYRO_NS_HOSTNAME':     '192.168.4.93',

This didn't work either. Also after rebooting/restarting the Pyro nameserver.

Does anyone have any idea what else I could try to get it working? I also ran the OpenOPC client on my windows computer (same one as the OPC server) and this worked. I use the same version of Pyro on my Windows computer and Ubuntu computer.

Edit: I have also changed OpenOPCService.py:

opc_gate_host = None 
into 
opc_gate_host = '192.168.4.93'

This doesn't work either...

Could anyone please help? I'm working on this now for over a day without any succes so far...