Thanks for confirming that reverting to the older version restores connectivity.
This is not an ideal situation, we definitely don’t want you to be stuck with this old version.
Web proxies are capricious beasts, between the different protocols and auth mechanisms, and it would be impractical for us to maintain an infrastructure to test all different combinations.
In this case, I would be curious to see what happens if, instead of passing the -Dhttp(s).proxyXxx=zzz properties, we use -Djava.net.useSystemProxies=true and let the JVM rely on the system-configured proxy.
Would you be willing to help us investigate and try this with the latest version? Thanks!