cannot start agent on KVM/Ubuntu

[sebgoa]

Hi,

I am on ubuntu 12.04 with KVM.
I was playing with various network configuration and messed up my agent. Now 
when I start to start it I get:
# service cloudstack-agent start
 * Starting CloudStack Agent cloud-agent                                        
                                                                                
  
 cat: /var/run/cloud-agent.pid: No such file or directory
 * jsvc failed to start

I tried various things including removing the package and re-installating but 
to no avail. The logs do say that it started (it's 4.1.1)

thoughts ?

-sebastien