Hi everybody,

Could  you help me please with a hard nut to crack? We have the following situation:
When calling the userinfo endpoint over an enterprise proxy server (js adapter loadUserInfo() method):

https://hostname/auth/realms/realmname/protocol/openid-connect/userinfo

we get 403 Forbidden with no Access-Controls headers set. Here is the funny part - it happens only in Chrome, Firefox and Opera. With Safari and IE11 it seems to be working. 

The stacktrace from server.log does not tell me much....:
11:30:31,906 ERROR [org.jboss.resteasy.resteasy_jaxrs.i18n] (http-/159.232.186.74:8443-6) RESTEASY000105: Failed to execute: org.keycloak.services.ErrorResponseException
        at org.keycloak.protocol.oidc.endpoints.UserInfoEndpoint.issueUserInfo(UserInfoEndpoint.java:130) [keycloak-services-1.7.0.Final.jar:1.7.0.Final]
        at org.keycloak.protocol.oidc.endpoints.UserInfoEndpoint.issueUserInfoGet(UserInfoEndpoint.java:103) [keycloak-services-1.7.0.Final.jar:1.7.0.Final]
        at sun.reflect.GeneratedMethodAccessor342.invoke(Unknown Source) [:1.8.0_66]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [rt.jar:1.8.0_66]
        at java.lang.reflect.Method.invoke(Method.java:497) [rt.jar:1.8.0_66]
        at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:168) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
        at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:269) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
        at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:227) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
        at org.jboss.resteasy.core.ResourceLocator.invokeOnTargetObject(ResourceLocator.java:158) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
        at org.jboss.resteasy.core.ResourceLocator.invoke(ResourceLocator.java:106) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
        at org.jboss.resteasy.core.ResourceLocator.invokeOnTargetObject(ResourceLocator.java:153) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
        at org.jboss.resteasy.core.ResourceLocator.invoke(ResourceLocator.java:91) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
        at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:561) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
        at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:543) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
        at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:128) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
        at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
        at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
        at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) [resteasy-jaxrs-2.3.12.Final-redhat-1.jar:]
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.2.Final-redhat-2.jar:1.0.2.Final-redhat-2]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) [jbossweb-7.5.12.Final-redhat-1.jar:7.5.12.Final-redhat-1]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.5.12.Final-redhat-1.jar:7.5.12.Final-redhat-1]
        at org.keycloak.services.filters.KeycloakSessionServletFilter.doFilter(KeycloakSessionServletFilter.java:61) [keycloak-services-1.7.0.Final.jar:1.7.0.Final]
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) [jbossweb-7.5.12.Final-redhat-1.jar:7.5.12.Final-redhat-1]
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.5.12.Final-redhat-1.jar:7.5.12.Final-redhat-1]
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:231) [jbossweb-7.5.12.Final-redhat-1.jar:7.5.12.Final-redhat-1]
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.5.12.Final-redhat-1.jar:7.5.12.Final-redhat-1]
        at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.5.5.Final-redhat-3.jar:7.5.5.Final-redhat-3]
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:150) [jbossweb-7.5.12.Final-redhat-1.jar:7.5.12.Final-redhat-1]
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.5.12.Final-redhat-1.jar:7.5.12.Final-redhat-1]
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.5.12.Final-redhat-1.jar:7.5.12.Final-redhat-1]
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) [jbossweb-7.5.12.Final-redhat-1.jar:7.5.12.Final-redhat-1]
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:854) [jbossweb-7.5.12.Final-redhat-1.jar:7.5.12.Final-redhat-1]
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) [jbossweb-7.5.12.Final-redhat-1.jar:7.5.12.Final-redhat-1]
        at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) [jbossweb-7.5.12.Final-redhat-1.jar:7.5.12.Final-redhat-1]
        at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_66]


Thanks,
Adrian