Webservice does not come up

Plugins Performance Analyzer
1

Hey community,

I am currently trying out OpenSearch and everything seems to work fine, except for the Performance Analyzer webservice.

According to the opensearch log it is properly started:

Apr 14 14:27:22 opensearch03.local opensearch[26182]: [2022-04-14T14:27:22,967][INFO ][o.o.p.c.PluginSettings   ] [opensearch03.local] Config: metricsLocation: /dev/shm/performanceanalyzer/, metricsDeletionInterval: 1, httpsEnabled: false, cleanup-metrics-db-files: true, batch-metrics-retention-period-minutes: 7, rpc-port: 9650, webservice-port 9600
Apr 14 14:27:23 opensearch03.local opensearch[26182]: [2022-04-14T14:27:23,895][INFO ][o.o.p.PluginsService     ] [opensearch03.local] loaded plugin [opensearch-performance-analyzer]

And from what I see in the configuration, it looks solid as well:
GET /_opendistro/_performanceanalyzer/cluster/config

{
    "currentPerformanceAnalyzerClusterState": 1,
    "shardsPerCollection": 0,
    "batchMetricsRetentionPeriodMinutes": 7
}

GET /_opendistro/_performanceanalyzer/config

{
    "performanceAnalyzerEnabled": true,
    "rcaEnabled": false,
    "loggingEnabled": false,
    "shardsPerCollection": 0,
    "batchMetricsEnabled": false,
    "batchMetricsRetentionPeriodMinutes": 7
}

Data is also written to /dev/shm/performanceanalyzer/.
However port 9600 remains closed. Changing the port to a different one did not help either. Do you have any ideas how to troubleshoot this?