No connection to InfluxDB after Update to 3.1

After the update in openhabian-config I cannot connect to my influxDB any more.

Trying to start influxd (in version 1.8.9) gives me:

openhabian@openHABianPi:~ $ influxd
2021-09-04T22:23:23.482863Z     info    InfluxDB starting       {"log_id": "0WOj                                                    OaMW000", "version": "1.8.9", "branch": "1.8", "commit": "d9b56321d579"}
2021-09-04T22:23:23.483029Z     info    Go runtime      {"log_id": "0WOjOaMW000"                                                    , "version": "go1.13.8", "maxprocs": 4}
run: open server: listen: listen tcp 127.0.0.1:8088: bind: address already in use

But port 8088 is not in use.

 sudo netstat -lptn
[sudo] password for openhabian:
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 127.0.0.1:8101          0.0.0.0:*               LISTEN      651/java
tcp        0      0 0.0.0.0:9001            0.0.0.0:*               LISTEN      653/node
tcp        0      0 0.0.0.0:139             0.0.0.0:*               LISTEN      1077/smbd
tcp        0      0 0.0.0.0:5007            0.0.0.0:*               LISTEN      651/java
tcp        0      0 0.0.0.0:8080            0.0.0.0:*               LISTEN      651/java
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      991/lighttpd
tcp        0      0 127.0.0.1:42229         0.0.0.0:*               LISTEN      651/java
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      732/sshd
tcp        0      0 127.0.0.1:8088          0.0.0.0:*               LISTEN      3462/influxd
tcp        0      0 0.0.0.0:1880            0.0.0.0:*               LISTEN      377/node-red
tcp        0      0 0.0.0.0:8443            0.0.0.0:*               LISTEN      651/java
tcp        0      0 0.0.0.0:1883            0.0.0.0:*               LISTEN      469/mosquitto
tcp        0      0 0.0.0.0:445             0.0.0.0:*               LISTEN      1077/smbd
tcp        0      0 0.0.0.0:10080           0.0.0.0:*               LISTEN      404/inetd
tcp6       0      0 :::139                  :::*                    LISTEN      1077/smbd
tcp6       0      0 :::80                   :::*                    LISTEN      991/lighttpd
tcp6       0      0 :::22                   :::*                    LISTEN      732/sshd
tcp6       0      0 :::3000                 :::*                    LISTEN      657/grafana-server
tcp6       0      0 :::1883                 :::*                    LISTEN      469/mosquitto
tcp6       0      0 :::445                  :::*                    LISTEN      1077/smbd

The openhab-log gives this error:

[ERROR] [org.influxdb.impl.BatchProcessor    ] - Batch could not be sent. Data will be lost
org.influxdb.InfluxDBIOException: java.net.ConnectException: Failed to connect to localhost/127.0.0.1:8086
	at org.influxdb.impl.InfluxDBImpl.execute(InfluxDBImpl.java:831) ~[bundleFile:?]

I tried to apply some hints out of the forum with chmod, controlled my config but still the same.
I even tried to reinstall influxDB using the openhabian-config but even this ends with an error.

Any ideas? Regards, Fred

Looks like influxd runs on port 8088 and openhab tries to connect to port 8086.

Thanks for the hint but I think InfluxDB uses both ports: 8086 an 8088.
And it seems 8086 is missing!

From InfluxDB ports | InfluxDB OSS 1.8 Documentation

InfluxDB ports

Enabled ports

8086

The default port that runs the InfluxDB HTTP service. Configure this port in the configuration file.

8088

The default port used by the RPC service for RPC calls made by the CLI for backup and restore operations (influxdb backup and influxd restore). Configure this port in the configuration file.

But your list shows it is in use, by influxdb. Seeing as the instance that you tried to start could not grab 8088 because it was in use, this suggests there are two instances here?