apicurio-studio: Login exception

I get an error after login screen.

Here is the stacktrace :

09:28:48,018 ERROR [org.keycloak.adapters.OAuthRequestAuthenticator] (default task-12) failed to turn code into token: java.net.ConnectException: Connection tim
ed out: connect
        at java.net.TwoStacksPlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)

I’m behind an entreprise proxy so I bet on a proxy configuration problem… But I don’t know how to set up an httpproxy that can be used by keycloak client adapter.

I tried to add this in my standalone-apicurio.xml file

		<property name="http.proxyHost" value="localhost"/>
		<property name="http.proxyPort" value="3129"/>
		<property name="https.proxyHost" value="localhost"/>
		<property name="https.proxyPort" value="3129"/>
    </system-properties>

and to add

set "JAVA_OPTS=%JAVA_OPTS% -Dhttp.proxyHost=localhost -Dhttp.proxyPort=3129 -Dhttps.proxyHost=localhost -Dhttps.proxyPort=3129" 

in the standalone.conf.bat

without success.

Any idea?