We just did a big network over haul at my job and every since the 
change amanda does not back up some machines. I looked in the latest log 
file and it states. "Error planner request to amanda.transolutions.net 
failed: timeout waiting for ACK".
    

Hi,

I'd check for network connectivityproblem, can the client reach the
server, can the server reach the client? Can addresses resolve? Have
you updated the firewall on both machines?

Olivier