ADDITIONAL SYSTEM INFORMATION :
Windows 10 10.0.18363 Build 18363
Java 14.0.1

A DESCRIPTION OF THE PROBLEM :
Using some VPNs or firewalls on Windows, it is impossible to create a HttpClient, because it seems to attempt to connect to some loopback address immediately.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Call HttpClient.newHttpClient() on a machine while running a VPN or firewall that blocks _all_ connections.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Some instance of HttpClient is returned
ACTUAL -
Exception in thread "Main" java.lang.InternalError: java.io.IOException: Unable to establish loopback connection
        at java.net.http/jdk.internal.net.http.HttpClientImpl.<init>(HttpClientImpl.java:313)
        at java.net.http/jdk.internal.net.http.HttpClientImpl.create(HttpClientImpl.java:255)
        at java.net.http/jdk.internal.net.http.HttpClientBuilderImpl.build(HttpClientBuilderImpl.java:135)
        at java.net.http/java.net.http.HttpClient.newHttpClient(HttpClient.java:158)
        ...
Caused by: java.io.IOException: Unable to establish loopback connection
        at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:94)
        at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:61)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:554)
        at java.base/sun.nio.ch.PipeImpl.<init>(PipeImpl.java:171)
        at java.base/sun.nio.ch.SelectorProviderImpl.openPipe(SelectorProviderImpl.java:50)
        at java.base/java.nio.channels.Pipe.open(Pipe.java:155)
        at java.base/sun.nio.ch.WindowsSelectorImpl.<init>(WindowsSelectorImpl.java:142)
        at java.base/sun.nio.ch.WindowsSelectorProvider.openSelector(WindowsSelectorProvider.java:44)
        at java.base/java.nio.channels.Selector.open(Selector.java:295)
        at java.net.http/jdk.internal.net.http.HttpClientImpl$SelectorManager.<init>(HttpClientImpl.java:710)
        at java.net.http/jdk.internal.net.http.HttpClientImpl.<init>(HttpClientImpl.java:310)
        ... 46 more
Caused by: java.net.ConnectException: Connection refused: connect
        at java.base/sun.nio.ch.Net.connect0(Native Method)
        at java.base/sun.nio.ch.Net.connect(Net.java:503)
        at java.base/sun.nio.ch.Net.connect(Net.java:492)
        at java.base/sun.nio.ch.SocketChannelImpl.connect(SocketChannelImpl.java:751)
        at java.base/java.nio.channels.SocketChannel.open(SocketChannel.java:194)
        at java.base/sun.nio.ch.PipeImpl$Initializer$LoopbackConnector.run(PipeImpl.java:127)
        at java.base/sun.nio.ch.PipeImpl$Initializer.run(PipeImpl.java:76)
        ... 56 more

---------- BEGIN SOURCE ----------
public static void main(String args[]) {
    java.net.http.HttpClient.newHttpClient();
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Disable VPN or firewall

FREQUENCY : always