[Port-configurability] Standard bucket : errors "could not listen on port xxx" in logs regardless of port used

Scenario
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• Install 3 instances of CB on 3 sudo users on same box
• Cluster them
• Create default, sasl and standard buckets and load data.

Data loads fine BUT with multiple errors like the following filling up the log.

Error seen
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Port server

on node 'babysitter_of_ns_1_2@127.0.0.1' exited with status 1. Restarting. Messages: 2014-01-23 11:17:50: (cproxy_config.c.315) env: MOXI_SASL_PLAIN_USR (8)
2014-01-23 11:17:52: (cproxy.c.330) ERROR: could not listen on port 65535. Please use -Z port_listen=PORT_NUM to specify a different port number.

The port for standard bucket was initially set to 11333, 11339 and then 65535. Regardless of the port used, the error is always seen. Load, rebalance, failover, reboot all work fine though.

Attaching screenshot and log from a node.