We have NAV 2015 setup in a 3-tier architecture with HO and Retail Stores distributed across locations.  We have implemented PUSH job services from HO to Stores.  Most of the stores are connecting successfully.

When testing connections through the Distribution Location document, there is an error in few stores

"Could not connect to net.tcp://hostname:16860/Job.  The connection attempt lasted for a time span of 00:00:01.8148073.  TCP error code 10061: No connection could be made because the target machine actively refused it"

Firewall rule is enabled for Ports 16860 (Data Director), 1433 (SQL) etc.  Port Forwarding is also enabled in the network router at the store. Net.TCP Port Sharing service is enabled and running.  Not able to Telnet as well to any of the open ports.

Can any one help with this please? Many thanks in advance.