But the real problem, was a IP address mapping problem. On my network my LaserWriter has a fixed IP address that was not excluded from the router's IP mapping range, htis creating a duplicate IP address on my network, thus a network conflict.
After all these hours searching, I finally discovered that my printer's IP addresse was duplicated when I saw the list of the device managed by my router in the Airport Utility.
With a litle help here and there, the solution got obvious. Hoping this helps others.
Your printer's IP address is fixed. If your network is not configured to reserve your printer's IP address or to excluded it from your router's IP range, it is probable that your printer's IP address is in conflict with another IP address on your network.
To help you, here are 2 links that should help you get running: