Anyone tried to implement APM on F5 with KeyCloak as backend? and did it work? #44902

spictera · 2025-12-15T08:12:58Z

spictera
Dec 15, 2025

Hi,

I tried to implement F5 Loadbalancer with APM pointing out Keycloak for a service.
Once the users are authenticated, the F5 Loadbalancer will open access for the backend service.
I am intending to use the same shared Client in Keycloak, so that the users are not needed to re-authenticate.

I can see that the users gets authenticated from F5, but the id "code to token" fails for some strange reason, where Keycloak rejects the request.

Any idea how to troubleshoot this into what causing this issue?
Or anyone has a good guide to implement this?

Regards Tomas

spictera · 2025-12-15T13:23:57Z

spictera
Dec 15, 2025
Author

It is completely impossible to get the cause of error in Keycloak

{
  "timestamp": "2025-12-15T13:07:15.657488672Z",
  "sequence": 4814,
  "loggerClassName": "org.keycloak.services.ServicesLogger_$logger",
  "loggerName": "org.keycloak.services",
  "level": "WARN",
  "message": "KC-SERVICES0013: Failed authentication",
  "threadName": "executor-thread-21",
  "threadId": 10240,
  "mdc": {},
  "ndc": "",
  "hostName": "myserver",
  "processName": "/usr/lib/jvm/java-21-openjdk-21.0.9.0.10-1.el9.x86_64/bin/java",
  "processId": 1,
  "exception": {
    "refId": 1,
    "exceptionType": "org.keycloak.authentication.AuthenticationFlowException",
    "message": null,
    "frames": [
      {
        "class": "org.keycloak.authentication.AuthenticationProcessor",
        "method": "authenticateOnly",
        "line": 1128
      },
      {
        "class": "org.keycloak.authentication.AuthenticationProcessor",
        "method": "authenticate",
        "line": 955
      },
      {
        "class": "org.keycloak.protocol.AuthorizationEndpointBase",
        "method": "handleBrowserAuthenticationRequest",
        "line": 147
      },
      {
        "class": "org.keycloak.protocol.oidc.endpoints.AuthorizationEndpoint",
        "method": "buildAuthorizationCodeAuthorizationResponse",
        "line": 397
      },
      {
        "class": "org.keycloak.protocol.oidc.endpoints.AuthorizationEndpoint",
        "method": "process",
        "line": 235
      },
      {
        "class": "org.keycloak.protocol.oidc.endpoints.AuthorizationEndpoint",
        "method": "buildGet",
        "line": 119
      },
      {
        "class": "org.keycloak.protocol.oidc.endpoints.AuthorizationEndpoint$quarkusrestinvoker$buildGet_6f60a9d6a638ecbdbc87e15ef419b51708795641",
        "method": "invoke"
      },
      {
        "class": "org.jboss.resteasy.reactive.server.handlers.InvocationHandler",
        "method": "handle",
        "line": 29
      },
      {
        "class": "io.quarkus.resteasy.reactive.server.runtime.QuarkusResteasyReactiveRequestContext",
        "method": "invokeHandler",
        "line": 183
      },
      {
        "class": "org.jboss.resteasy.reactive.common.core.AbstractResteasyReactiveContext",
        "method": "run",
        "line": 147
      },
      {
        "class": "io.quarkus.vertx.core.runtime.VertxCoreRecorder$15",
        "method": "runWith",
        "line": 645
      },
      {
        "class": "org.jboss.threads.EnhancedQueueExecutor$Task",
        "method": "doRunWith",
        "line": 2651
      },
      {
        "class": "org.jboss.threads.EnhancedQueueExecutor$Task",
        "method": "run",
        "line": 2630
      },
      {
        "class": "org.jboss.threads.EnhancedQueueExecutor",
        "method": "runThreadBody",
        "line": 1622
      },
      {
        "class": "org.jboss.threads.EnhancedQueueExecutor$ThreadBody",
        "method": "run",
        "line": 1589
      },
      {
        "class": "org.jboss.threads.DelegatingRunnable",
        "method": "run",
        "line": 11
      },
      {
        "class": "org.jboss.threads.ThreadLocalResettingRunnable",
        "method": "run",
        "line": 11
      },
      {
        "class": "io.netty.util.concurrent.FastThreadLocalRunnable",
        "method": "run",
        "line": 30
      },
      {
        "class": "java.lang.Thread",
        "method": "run",
        "line": 1583
      }
    ]
  }
}

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Anyone tried to implement APM on F5 with KeyCloak as backend? and did it work? #44902

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Anyone tried to implement APM on F5 with KeyCloak as backend? and did it work? #44902

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spictera Dec 15, 2025

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spictera
Dec 15, 2025

spictera
Dec 15, 2025
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