check your network configuration:
- do you have ipfilter/ipchains running
- do you have multicast enabled
- is your 127.0.0.1 address correctly set?
there are a few hints on this in the doco.
yes~after i re-compile my kernel and turn on the Multicast routing ,the 1st issue disappears, but the 2nd issue is still.
What was the second problem? Farming?
If the first one is resolved, the second one should as well. Are you sure you've deployed the farm folder in both nodes?