Metricbeat get 403 when retrieving data from Jolokia over network

Hello !

I'm currently trying to retrieve JVM metrics through Jolokia and Metricbeat but i'm facing an issue. When Metricbeat (on server 1) calls Jolokia agents (on server 2) over the network i get 403 HTTP response. But if i install metricbeat on server 1 and use the same configuration (except that hosts are changed), it works like a charm.

Here is the error received :

{
	"log.level": "error",
	"@timestamp": "2025-02-10T12:03:52.382+0100",
	"log.origin": {
		"function": "[github.com/elastic/beats/v7/metricbeat/mb/module.(*metricSetWrapper).handleFetchError](http://github.com/elastic/beats/v7/metricbeat/mb/module.%28*metricSetWrapper%29.handleFetchError)",
		"[file.name](http://file.name)": "module/wrapper.go",
		"file.line": 333
	},
	"message": "Error fetching data for metricset jolokia.jmx: HTTP error 403 in : 403 Forbidden",
	"[service.name](http://service.name)": "metricbeat",
	"ecs.version": "1.6.0"
}

Jolokia agents have no authentication configured. No SSL configuration neither.
So i don't understand why i have this issue. Can you help to understand and fix this ?

Here is the configuration of Metricbeat and jolokia plugin (module metricbeat)

metricbeat.yml

###################### Metricbeat Configuration Example #######################

# This file is an example configuration file highlighting only the most common
# options. The metricbeat.reference.yml file from the same directory contains all the
# supported options with more comments. You can use it as a reference.
#
# You can find the full configuration reference here:
# https://www.elastic.co/guide/en/beats/metricbeat/index.html

# =========================== Modules configuration ============================

metricbeat.config.modules:
  # Glob pattern for configuration loading
  path: ${path.config}/modules.d/*.yml

  # Set to true to enable config reloading
  reload.enabled: false

  # Period on which files under path should be checked for changes
  #reload.period: 10s

# ======================= Elasticsearch template setting =======================

setup.template.settings:
  index.number_of_shards: 1
  index.codec: best_compression
  #_source.enabled: false


# ================================== General ===================================

# The name of the shipper that publishes the network data. It can be used to group
# all the transactions sent by a single shipper in the web interface.
#name:

# The tags of the shipper are included in their field with each
# transaction published.
#tags: ["service-X", "web-tier"]

# Optional fields that you can specify to add additional information to the
# output.
#fields:
#  env: staging

# ================================= Dashboards =================================
# These settings control loading the sample dashboards to the Kibana index. Loading
# the dashboards is disabled by default and can be enabled either by setting the
# options here or by using the `setup` command.
#setup.dashboards.enabled: false

# The URL from where to download the dashboard archive. By default, this URL
# has a value that is computed based on the Beat name and version. For released
# versions, this URL points to the dashboard archive on the artifacts.elastic.co
# website.
#setup.dashboards.url:

# =================================== Kibana ===================================

# Starting with Beats version 6.0.0, the dashboards are loaded via the Kibana API.
# This requires a Kibana endpoint configuration.
#setup.kibana:

  # Kibana Host
  # Scheme and port can be left out and will be set to the default (http and 5601)
  # In case you specify and additional path, the scheme is required: http://localhost:5601/path
  # IPv6 addresses should always be defined as: https://[2001:db8::1]:5601
  #host: "localhost:5601"

  # Kibana Space ID
  # ID of the Kibana Space into which the dashboards should be loaded. By default,
  # the Default Space will be used.
  #space.id:

# =============================== Elastic Cloud ================================

# These settings simplify using Metricbeat with the Elastic Cloud (https://cloud.elastic.co/).

# The cloud.id setting overwrites the `output.elasticsearch.hosts` and
# `setup.kibana.host` options.
# You can find the `cloud.id` in the Elastic Cloud web UI.
#cloud.id:

# The cloud.auth setting overwrites the `output.elasticsearch.username` and
# `output.elasticsearch.password` settings. The format is `<user>:<pass>`.
#cloud.auth:

# ================================== Outputs ===================================

# Configure what output to use when sending the data collected by the beat.

# ---------------------------- Elasticsearch Output ----------------------------
#output.elasticsearch:
  # Array of hosts to connect to.
  #hosts: ["localhost:9200"]

  # Performance preset - one of "balanced", "throughput", "scale",
  # "latency", or "custom".
  #preset: balanced

  # Protocol - either `http` (default) or `https`.
  #protocol: "https"

  # Authentication credentials - either API key or username/password.
  #api_key: "id:api_key"
  #username: "elastic"
  #password: "changeme"

# ------------------------------ Logstash Output -------------------------------
output.logstash:
  # The Logstash hosts
  hosts: ["XXX.XXX.XXX.XXX:XXXXXX"]

  # Optional SSL. By default is off.
  # List of root certificates for HTTPS server verifications
  #ssl.certificate_authorities: ["/etc/pki/root/ca.pem"]

  # Certificate for SSL client authentication
  #ssl.certificate: "/etc/pki/client/cert.pem"

  # Client Certificate Key
  #ssl.key: "/etc/pki/client/cert.key"

# ================================= Processors =================================

# Configure processors to enhance or manipulate events generated by the beat.

processors:
#  - add_host_metadata: ~
#  - add_cloud_metadata: ~
#  - add_docker_metadata: ~
#  - add_kubernetes_metadata: ~
#  - add_process_metadata: ~


# ================================== Logging ===================================

# Sets log level. The default log level is info.
# Available log levels are: error, warning, info, debug
#logging.level: debug

# At debug level, you can selectively enable logging only for some components.
# To enable all selectors, use ["*"]. Examples of other selectors are "beat",
# "publisher", "service".
#logging.selectors: ["*"]
logging.metrics.enabled: false

# ============================= X-Pack Monitoring ==============================
# Metricbeat can export internal metrics to a central Elasticsearch monitoring
# cluster.  This requires xpack monitoring to be enabled in Elasticsearch.  The
# reporting is disabled by default.

# Set to true to enable the monitoring reporter.
#monitoring.enabled: false

# Sets the UUID of the Elasticsearch cluster under which monitoring data for this
# Metricbeat instance will appear in the Stack Monitoring UI. If output.elasticsearch
# is enabled, the UUID is derived from the Elasticsearch cluster referenced by output.elasticsearch.
#monitoring.cluster_uuid:

# Uncomment to send the metrics to Elasticsearch. Most settings from the
# Elasticsearch outputs are accepted here as well.
# Note that the settings should point to your Elasticsearch *monitoring* cluster.
# Any setting that is not set is automatically inherited from the Elasticsearch
# output configuration, so if you have the Elasticsearch output configured such
# that it is pointing to your Elasticsearch monitoring cluster, you can simply
# uncomment the following line.
#monitoring.elasticsearch:

# ============================== Instrumentation ===============================

# Instrumentation support for the metricbeat.
#instrumentation:
    # Set to true to enable instrumentation of metricbeat.
    #enabled: false

    # Environment in which metricbeat is running on (eg: staging, production, etc.)
    #environment: ""

    # APM Server hosts to report instrumentation results to.
    #hosts:
    #  - http://localhost:8200

    # API Key for the APM Server(s).
    # If api_key is set then secret_token will be ignored.
    #api_key:

    # Secret token for the APM Server(s).
    #secret_token:


# ================================= Migration ==================================

# This allows to enable 6.7 migration aliases
#migration.6_to_7.enabled: true

Jolokia plugin configuration :

# Module: jolokia
# Docs: https://www.elastic.co/guide/en/beats/metricbeat/8.x/metricbeat-module-jolokia.html

- module: jolokia
  metricsets: ["jmx"]
  period: 60s
  hosts: [
            "XXXXXXXXX:4242",
            "XXXXXXXXX:4243",
            "XXXXXXXXX:4244",
            "XXXXXXXXX:4245",
            "XXXXXXXXX:4246",
            "XXXXXXXXX:4247",
            "XXXXXXXXX:4248",
            "XXXXXXXXX:4249"
        ]
  namespace: "metrics"
  path: "/jolokia/read/"
  #username: "user"
  #password: "secret"
  jmx.mappings:
    - mbean: 'java.lang:type=Memory'
      attributes:
        - attr: HeapMemoryUsage
          field: memory.heap_usage
    - mbean: 'java.lang:type=Threading'
      attributes:
        - attr: ThreadCount
          field: threads.count
    - mbean: 'java.lang:type=OperatingSystem'
      attributes:
        - attr: ProcessCpuLoad
          field: os.processCpuLoad
    - mbean: 'java.lang:type=GarbageCollector,name=G1 Young Generation'
      attributes:
        - attr: CollectionCount
          field: gc.young.collectionCount
        - attr: CollectionTime
          field: gc.young.collectionTime
        - attr: LastGcInfo
          field: gc.young.lastGcInfo
    - mbean: 'java.lang:type=GarbageCollector,name=G1 Old Generation'
      attributes:
        - attr: CollectionCount
          field: gc.old.collectionCount
        - attr: CollectionTime
          field: gc.old.collectionTime
        - attr: LastGcInfo
          field: gc.old.lastGcInfo
    - mbean: 'java.nio:type=BufferPool,name=direct'
      attributes:
        - attr: MemoryUsed
          field: nio.direct.memoryUsed
        - attr: Count
          field: nio.direct.count
    - mbean: 'java.nio:type=BufferPool,name=mapped'
      attributes:
        - attr: MemoryUsed
          field: nio.mapped.memoryUsed
        - attr: Count
          field: nio.mapped.count
    - mbean: 'java.lang:type=Runtime'
      attributes:
        - attr: Name
          field: runtime.name
        - attr: InputArguments
          field: runtime.inputArgs
        - attr: Pid
          field: runtime.pid
          
  jmx.application:
  jmx.instance:

Thanks you !

Regards,
Nso