not able to telnet or curl <node-ip>:<node-port> kubernetes

Question

Not able to telnet or curl :

discovery-server       NodePort       10.109.29.219    34.0.0.96   8761:31792/TCP   20d

telnet 34.0.0.96:31792 does not return anything 
curl http://34.0.0.96:31792 does not return anything 

if I enter the container and curl http://localhost:8761 then it's working fine

what could be the issue

all ports are open in security group.