Error creating TransportClient for dedicated master-data ES cluster (1.1)

Hi,

We have Dedicated Master (3) , Data (24) and Search (3) Nodes ES 1.1
version deployment.

We use Transport Client to get NodeStatsResponse so that all the nodes can
report their individual statistics.

Cluster is in Green state but out of all these nodes, 1 Master node,
1 Search node and few Data Nodes are not able to create Transport Clients
after few days.

But other nodes are able to create Transport Client.

All the nodes use same code to create Transport Client.

Not sure what's going on ?

Can somebody please help in this case ?

Thanks

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