I used this approach:
Taken from https://community.cisco.com/t5/cisco-software-discussions/ssm-smart-software-manager-on-prem-7-unable-to-reach-cisco/m-p/4566781#M4493
1) Login on the CLI via SSH, admin user
2) become superuser (root password):
su -
...
I'm having the similar issue as well. When I tested the phone connected straight to the switchport, it works!. Surely physical connectivity issue from user cubicle network faceplate to the patch management rack.
