At a minium the Cloud Connector Binding. Jetty may need to be put in trace log level too, though I wouldn’t expect much useful from that.
Like yours or exactly yours. All of the similar threads I recall reading had no connectivity between OH and myopenhab.org, or had problems exposing Items to IFTTT through myopenhab.org. This is the first thread I’ve seen that indicates remote connections being refused.
And if the problem were in the configs, and you didn’t change the configs, then we would all be seeing this problem, not just a few.