Attempting to use the service: https://mymavenrepo.com fails because they are using SNI for the repository root: https://repo.mymavenrepo.com
It would appear that updating the Apache HttpClient to a version newer than 4.3.2 should work (per ticket https://issues.apache.org/jira/browse/HTTPCLIENT-1119)
Note that uploading to the repository works because it appears that the Maven mechanism for uploading is different.
The error stack shows Ivy as the client, even though I indicated in the build script that maven was the repository type. I suppose this could be some sort of compatibility offered by the Ivy libraries, but it would be nice if there was a way to force maven as the mechanism implementation.