OL-1223 — Proxy scheme is not supported
What happened
The configured proxy URL names a scheme this build cannot speak: anything outside http/https/socks5/socks5h, or negotiate requested against a build compiled without the Kerberos feature. Fails fast at proxy resolution rather than silently falling through to a plain connect — a silent downgrade would route traffic around the very proxy the operator configured. Fix the scheme in the proxy URL, or rebuild with the feature that scheme requires.
What to do
Set a proxy URL that starts with http, https, socks5 or socks5h with openlatch system proxy set.