[keycloak-user] Force Keycloak to use external IdP as authentication mechanism

We have a requirement to disable local login (username/password) and allow login through IdPs configured in Identity broker. To test this scenario I have configured Salesforce as SP and Keycloak as IDP. And in IdP (keycloak) disabled "Forms" based login and configured an external IdP as identity broker. But this configuration resulting in "Invalid username or password." error in keycloak. In logs I observed following stack trace. 01:36:06,532 WARN [org.keycloak.services] (default task-40) KC-SERVICES0013: Failed authentication: org.keycloak.authentication.AuthenticationFlowException at org.keycloak.authentication.AuthenticationProcessor.authenticateOnly(AuthenticationProcessor.java:795) at org.keycloak.authentication.AuthenticationProcessor.authenticate(AuthenticationProcessor.java:667) at org.keycloak.protocol.AuthorizationEndpointBase.handleBrowserAuthenticationRequest(AuthorizationEndpointBase.java:123) at org.keycloak.protocol.saml.SamlService.newBrowserAuthentication(SamlService.java:527) at org.keycloak.protocol.saml.SamlService.newBrowserAuthentication(SamlService.java:523) at org.keycloak.protocol.saml.SamlService$BindingProtocol.loginRequest(SamlService.java:310) at org.keycloak.protocol.saml.SamlService$BindingProtocol.handleSamlRequest(SamlService.java:221) at org.keycloak.protocol.saml.SamlService$RedirectBindingProtocol.execute(SamlService.java:514) at org.keycloak.protocol.saml.SamlService.redirectBinding(SamlService.java:536) at sun.reflect.GeneratedMethodAccessor686.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:139) at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:295) at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:249) at org.jboss.resteasy.core.ResourceLocatorInvoker.invokeOnTargetObject(ResourceLocatorInvoker.java:138) at org.jboss.resteasy.core.ResourceLocatorInvoker.invoke(ResourceLocatorInvoker.java:101) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:395) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:202) at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:221) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:56) at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:51) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:85) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:129) at org.keycloak.services.filters.KeycloakSessionServletFilter.doFilter(KeycloakSessionServletFilter.java:90) at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131) at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84) at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131) at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60) at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77) at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50) at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:284) at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:263) at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81) at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:174) at io.undertow.server.Connectors.executeRootHandler(Connectors.java:202) at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:793) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) 01:36:06,532 WARN [org.keycloak.events] (default task-40) type=LOGIN_ERROR, realmId=salesforce, clientId=https://saml.salesforce.com, userId=null, ipAddress=10.0.2.2, error=invalid_user_credentials, auth_method=saml, redirect_uri= https://jason-dev-ed.my.salesforce.com?so=00D62000005vWGB, code_id=96d4d981-decd-47ed-ae08-09dfa5c6d6f4 Any idea how to disable the username/password prompt during the login and force keycloak to use configured identity brokers? Also, in case I have multiple external IdPs configured as identity brokers in my keycloak instance is there any way to inform keycloak to use particular external IdP (broker). I know we can use kc_idp_hint parameter. This will be helpful during IdP initiated sso but in case it is a SP initiated SSO, how can we specify the default external IdP? Thanks!