----------System.err:(41/2781)----------
java.net.SocketException: Protocol family unavailable
at java.base/sun.nio.ch.Net.connect0(Native Method)
at java.base/sun.nio.ch.Net.connect(Net.java:493)
at java.base/sun.nio.ch.Net.connect(Net.java:482)
at java.base/sun.nio.ch.NioSocketImpl.connect(NioSocketImpl.java:588)
at java.base/java.net.SocksSocketImpl.connect(SocksSocketImpl.java:339)
at java.base/java.net.Socket.connect(Socket.java:585)
at java.base/java.net.Socket.connect(Socket.java:534)
at java.base/java.net.Socket.<init>(Socket.java:457)
at java.base/java.net.Socket.<init>(Socket.java:265)
at HttpProxy$ConnectProxyTunnelServer.processRequest(HttpProxy.java:255)
at HttpProxy$ConnectProxyTunnelServer.run(HttpProxy.java:209)
java.net.SocketException: Unexpected end of file from server
at java.base/sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:862)
at java.base/sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:689)
at java.base/sun.net.www.protocol.http.HttpURLConnection.doTunneling(HttpURLConnection.java:2074)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at java.base/java.net.HttpConnectSocketImpl.doTunneling(HttpConnectSocketImpl.java:208)
at java.base/java.net.HttpConnectSocketImpl.doTunnel(HttpConnectSocketImpl.java:197)
at java.base/java.net.HttpConnectSocketImpl$2.run(HttpConnectSocketImpl.java:177)
at java.base/java.net.HttpConnectSocketImpl$2.run(HttpConnectSocketImpl.java:175)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:553)
at java.base/java.net.HttpConnectSocketImpl.privilegedDoTunnel(HttpConnectSocketImpl.java:174)
at java.base/java.net.HttpConnectSocketImpl.connect(HttpConnectSocketImpl.java:121)
at java.base/java.net.Socket.connect(Socket.java:585)
at java.base/java.net.Socket.connect(Socket.java:534)
at HttpProxy.test(HttpProxy.java:117)
at HttpProxy.main(HttpProxy.java:82)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)
at java.base/java.lang.Thread.run(Thread.java:830)

Seen in:

java/net/Socks/SocksIPv6Test.java
java/net/Socket/HttpProxy.java