vbucketmigrator exits

This is from the UI console logs at a customer on 1.6.5.1r1:

Port server vbucketmigrator on node 'ns_1@172.29.167.221' exited with status 70. Restarting. Messages: Connecting to

{Sock 172.29.167.221:11210}

Authenticating towards:

{Sock 172.29.167.221:11210}

Authenticated towards:

{Sock 172.29.167.221:11210}

ns_port_server000 09:37:38 - Wed Feb 16, 2011

...and...

Port server vbucketmigrator on node 'ns_1@172.29.255.87' exited with status 74. Restarting. Messages: An error occured on the downstream connection..
Downstream connection closed.. shutdown upstream
Had 530 pending messages at exit. ns_port_server000 04:50:01 - Wed Feb 16, 2011

This is a 10 node cluster and all logs are attached here. One very confusing thing is that the logs seem to indicate vbucketmigrator having problems connecting to the same node it is running on? is that a logging bug or expected?