"Ignorning message." showing in the log while upgrade to 0.8

[Yan Chunlu]

I am running local tests about upgrade cassandra.  upgrade from 0.7.4 to
0.8.5
after upgrade one node1,  two problem happened:

1,  node2 keep saying:

"Received connection from newer protocol version. Ignorning message."

is that normal behaviour?

2, while running "describe cluster" on node1, it shows node2 unreachable:
Cluster Information:
   Snitch: org.apache.cassandra.locator.SimpleSnitch
   Partitioner: org.apache.cassandra.dht.RandomPartitioner
   Schema versions:
UNREACHABLE: [node2]
05f1ee3b-e063-11e0-97d5-63c2fb3f0ca8: [node1, node3]

node3 seems act normal.


I saw the JMXPORT has changed since 0.8, is that the reason node was
unreachable?


thanks!