RuntimeError: YClientError: Could not connect to x.x.x.x: Session status: Undefined

[arynair]

(test_venv) root@8ff5eb066f2e:/root/container/test_venv# python t ry1.py Trace: Unable to connect to 172.18.87.54:830 over IPv4 (Connection refused). Connection error occurred: Unable to connect to 172.18.87.54:830. NetconfSSHClient: NC session status: -1 Could not connect to 172.18.87.54: Session status: Undefined Traceback (most recent call last): File "try1.py", line 28, in protocol="ssh") File "/root/container/test_venv/lib/python3.6/site-packages/ydk/providers/netconf_provider.py", line 48, in init protocol, on_demand, common_cache, timeout) RuntimeError: YClientError: Could not connect to 172.18.87.54: Session status: Undefined

I am getting this error. i have followed the steps here : https://community.cisco.com/t5/yang-development-kit-ydk/netconfserviceprovider-is-not-able-to-establish-ssh-tunnel/td-p/3585193 but was not able to am still getting this error

i am able to login to the router via cli using : ssh -2 -s [email protected] netconf -p 830