cmcheckconf fail: Failed to probe network

[melvyn burnard]

well it could be any of these, including a switch configurationm issue.
You will need to investigate and trouble shoot, for example move the cables to a known working switch port etc.

[Benjamin Weng]

The problem has been fixed.
Root cause is the lan2 network adapter. The "lan2" I was using in fact is the lan3...
When I plug the cable into the real "lan2", all trouble had gone...
Sorry for my naive midtake and thank you all. I really learn much from the discussion.

ps:Anyone knows how to match the lan0/lan1/lan2/lan3/lan4 with the physical ports behind the machine? Every time I need to test a lot of times to know who is who...