LFD259 Lab 3.2 - cannot push correctly to local repo

Greetings ... having an issue with this lab at the point where I push to the local repo.
The registry appears to be running

NAME READY UP-TO-DATE AVAILABLE AGE
deployment.apps/nginx 1/1 1 1 18m
deployment.apps/registry 1/1 1 1 18m

NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
service/kubernetes ClusterIP 10.96.0.1 443/TCP 2d19h
service/nginx ClusterIP 10.111.191.243 443/TCP 17h
service/registry ClusterIP 10.107.252.139 5000/TCP 17h

NAME READY STATUS RESTARTS AGE
pod/nginx-65478f7767-2p7sz 1/1 Running 0 18m
pod/registry-7ccd695dc7-wcgvj 1/1 Running 0 18m

I have this in /etc/docker/daemon.json

{
"exec-opts": ["native.cgroupdriver=systemd"],
"log-driver": "json-file",
"log-opts": {
"max-size": "100m"
},
"storage-driver": "overlay2",
"insecure-registries":["10.107.252.139:5000"]
}

The push for the simpleapp hangs in the middle of the push

The push refers to repository [10.107.252.139:5000/tagtest]
a4399aeb9a0e: Pushed
35a91a75d24b: Pushed
ad44aa179b33: Pushing 1.011MB
2ce3c188c38d: Preparing

Any tips on how to diagnose?

Docker 19.03.6
OS 18.04
K8S 1.18.1

The final log messages displayed by journalctl -u docker.service are:

Sep 03 11:18:05 vbub01a dockerd[2573]: time="2020-09-03T11:18:05.289038252-07:00" level=info msg="ignoring event" module=libcontainerd namespace=moby topic=/tasks/delete type="*events.TaskDelete"
Sep 03 11:18:13 vbub01a dockerd[2573]: time="2020-09-03T11:18:13.072999300-07:00" level=warning msg="Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap."
Sep 03 11:23:26 vbub01a dockerd[2573]: time="2020-09-03T11:23:26.398379723-07:00" level=info msg="Attempting next endpoint for push after error: Get https://10.107.252.139:5000/v2/: http: server gave HTTP response to HTTPS client"