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To resolve a Wazuh deployment error, first identify which component is failing—manager/API, Filebeat, indexer, dashboard, or an upgrade boundary—then check that component’s service status and logs before changing configuration. Next verify the relevant network path, credentials, certificates, and version compatibility, and repeat the failed operation to confirm the expected recovery signal. The steps below cover common documented errors and the checks that distinguish an ingestion or indexing failure from a dashboard display problem.
Understand the components before troubleshooting
A Wazuh deployment includes agents and three central components: the Wazuh server, Wazuh indexer, and Wazuh dashboard. The server processes security data and generates alerts; the indexer stores and searches those alerts; the dashboard presents and explores the data. A failure at one stage can look like a problem somewhere else—for example, an empty dashboard may result from alerts never reaching the indexer.
Wazuh supports an all-in-one installation as well as distributed deployments. Quickstart is the documented all-in-one route. For a component-by-component installation, Wazuh’s workflow is indexer first, then server, then dashboard. See the Quickstart and Installation guide.
Size for endpoints, alert volume, and retention
Wazuh says hardware needs depend heavily on protected endpoints and cloud workloads. Its current Quickstart gives these single-host recommendations for 90 days of queryable, indexed alert data. They are guidance for that installation path, not a universal production capacity guarantee.
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| Agents | vCPU | RAM | Storage for 90 days |
|---|---|---|---|
| 1–25 | 4 | 8 GiB | 50 GB |
| 26–50 | 8 | 8 GiB | 100 GB |
| 51–100 | 8 | 8 GiB | 200 GB |
For larger deployments, Quickstart recommends a distributed design. The indexer guide separately recommends 8 CPU cores and 16 GB RAM per indexer node; it lists 4 cores and 4 GB RAM as the minimum. Its 90-day storage estimates vary by endpoint class and alerts per second (APS):
| Endpoint class | Estimated APS per endpoint | Estimated storage per endpoint for 90 days |
|---|---|---|
| Server | 0.25 | 3.7 GB |
| Workstation | 0.1 | 1.5 GB |
| Network device | 0.5 | 7.4 GB |
Using those estimates, Wazuh’s example of 80 workstations, 10 servers, and 10 network devices totals 231 GB for 90 days. These are Wazuh estimates and recommendations, not independent benchmarks; actual needs depend on alert volume and retention. See the Wazuh indexer installation guide.
Choose an installation layout that matches operations
| Consideration | All-in-one | Distributed or cluster deployment |
|---|---|---|
| Typical fit | Quickstart route for a single host within the stated sizing guidance | Wazuh’s recommended direction for larger environments |
| Components | Central components share a host | Components can be deployed separately; install indexer, server, then dashboard |
| Planning emphasis | Host capacity and storage for endpoint count, alert volume, and retention | Capacity per component, inter-component network paths, and the operational work of managing clusters, backups, certificates, and upgrades |
The central components require 64-bit Intel, AMD, or ARM Linux architecture. The current Quickstart lists Amazon Linux 2/2023, CentOS Stream 10, Red Hat Enterprise Linux 7–10, and Ubuntu 16.04, 18.04, 20.04, 22.04, and 24.04. Supported releases can change, so check the current requirements for each component and the Wazuh release you intend to install. Sources: Quickstart and Installation guide.
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Use a repeatable triage workflow
- Record the failure context. Capture the exact error, Wazuh component versions, operating system and version, deployment layout, and any recent upgrade, reinstall, or configuration changes. Preserve relevant logs; these details are also useful when reporting an upgrade problem.
- Map the symptom to a component. Decide whether it points to the manager/API, Filebeat or ingestion, indexer, dashboard, or a compatibility/configuration boundary. Do not begin by changing several components at once.
- Check service state and logs. Use
systemctl statusfor the named service. For dashboard details, inspect its journal withjournalctl; check manager messages in/var/ossec/logs/ossec.log, Filebeat logs for ingestion, and indexer logs under/var/log/wazuh-indexer. - Verify the specific connection path. Check that the configured endpoint address and port are reachable from the component that initiates the connection. For dashboard-to-indexer problems, inspect
opensearch.hostsand test from the dashboard host to the configured indexer endpoint on port 9200. - Check credentials, certificates, and versions. Compare the settings with the configuration for the installed release. Apply only the repair relevant to the identified symptom, then check logs for a new or changed error.
- Repeat the failed action and look for its success signal. Depending on the issue, that may be a responsive API, an alert index in the indexer, or a log entry beginning
INFO: IndexerConnector initialized successfully for index:.
For each check, record what was observed before making a change. That keeps the diagnosis useful and makes it easier to undo a change that did not address the failing layer.
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“Wazuh server API seems to be down error”
Check whether wazuh-manager is active. From the dashboard node, test the Wazuh API with an authenticated request using an authorized account. If the API is down, Wazuh’s dashboard troubleshooting guidance is to restart the manager and verify API access again. Do not put real credentials in shared command history or public examples. See Wazuh dashboard troubleshooting.
“No alerts on the Wazuh dashboard error”
Start by checking the indexer for an alert index matching wazuh-alerts-*. If no such index exists, the alerts are not stored in the indexer, so investigate upstream of dashboard visualization. Test Filebeat output and inspect the relevant logs for parsing problems, DNS or connection failures, TLS issues, and a target version mismatch. If the alert index does exist, the next checks are dashboard-side: confirm the relevant index pattern and selected time range. Wazuh’s troubleshooting page documents the index and Filebeat checks; the dashboard checks are follow-on diagnostics rather than a stated cause in that specific procedure. See Wazuh dashboard troubleshooting.
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“No username and password found in the keystore” or “IndexerConnector initialization failed”
The manager needs indexer credentials in the Wazuh keystore to send alerts and vulnerability data for indexing. For connector initialization failures, check the indexer address and port, certificate paths, credentials, and the <indexer> configuration in /var/ossec/etc/ossec.conf. Keep production secrets out of examples and do not replace them with literal sample credentials. Successful initialization is indicated by a manager log entry beginning INFO: IndexerConnector initialized successfully for index:. See Wazuh upgrade troubleshooting.
Vulnerability detection is disabled or misconfigured
After an upgrade or configuration change, check that vulnerability-detection is enabled and that the <indexer> block is valid and not duplicated. Confirm that wazuh-states-vulnerabilities-* exists and is green; if the index was not created, inspect manager logs. Do not revive the deprecated vulnerability-detector syntax without checking the configuration guide for the installed release. See Wazuh upgrade troubleshooting.
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Resolve dashboard API, compatibility, and readiness errors
“Could not connect to API with ID … Missing param: API USERNAME”
This specific message points to a missing or incorrectly named API username variable in the dashboard’s API configuration. In Wazuh 4.0 and later, the variable name changed from user to username. In /usr/share/wazuh-dashboard/data/wazuh/config/wazuh.yml, check the API entry’s username, password, url, port, and run_as settings against the configuration for your installed release. See Wazuh dashboard troubleshooting.
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“Wazuh server and Wazuh dashboard version mismatch error”
Wazuh states that the server and dashboard must use the same major and minor versions. Check both installed versions and follow the upgrade guide for the release in use; the documentation’s 4.14.x pairing is an example, not a permanent target version. See Wazuh dashboard troubleshooting.
“Wazuh dashboard server is not ready yet”
This can appear just after a dashboard start or restart, but it can also accompany dashboard restart loops, a failed dashboard-to-indexer connection, or an unhealthy indexer. Check dashboard service status and its warnings or errors first. Then verify opensearch.hosts in the dashboard configuration and test connectivity from the dashboard host to the configured indexer address on port 9200. If that path is unavailable, check indexer service status and logs under /var/log/wazuh-indexer. See Wazuh upgrade troubleshooting.
Recover missing dashboard objects and applications
“Saved object for index pattern not found error”
This can happen after an indexer reinstall removes saved objects while the dashboard remains running. Wazuh’s guidance is to restart the dashboard so it can initialize saved objects and required mappings. If data remains but objects are missing, the dashboard may migrate data to a new index. Before any manual index deletion or other destructive data operation, preserve backups and assess the local state. See Wazuh dashboard troubleshooting.
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“Application Not Found” after upgrade
For this post-upgrade symptom, check whether /etc/wazuh-dashboard/opensearch_dashboards.yml contains a stale default-route override. The documented setting is uiSettings.overrides.defaultRoute: /app/wz-home. Apply this fix in the context of the post-upgrade error rather than treating it as a general dashboard repair. See Wazuh dashboard troubleshooting and Wazuh upgrade troubleshooting.
Verify against the release you run
Wazuh configuration paths, supported operating systems, resource recommendations, and compatibility requirements can change between releases. Use the documentation for the installed version when validating settings or planning an upgrade. If the documented checks do not isolate the failure, collect the exact error, component versions, OS, deployment layout, relevant configuration, service status, and logs; without those details, a general guide cannot identify the cause in an individual environment.
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