Image url not showing graph

Hi all,

I am running openhab 1.8.3 on a raspberry pi 2. I use RRD4J as persistence service.

Today I switched towards https and using the login functionality. That part is working fine.

In the default sitemap I show a graph (several) which did work fine in the plain http version, but not anymore in the https version.

A part of the sitemap definitions is:

       Text item=Auriol_BuitenTempSensor_BalkonWK
        {
         Frame {
            Switch item=Weather_Chart_Period label="Period" mappings=[0="Hour", 1="Day", 2="Week"]
            Image url="http://192.168.1.21:8080/rrdchart.png?items=Auriol_BuitenTempSensor_BalkonWK&period=h" refresh=6000 visibili$
            Image url="http://192.168.1.21:8080/rrdchart.png?items=Auriol_BuitenTempSensor_BalkonWK&period=D" refresh=30000 visibil$
            Image url="http://192.168.1.21:8080/rrdchart.png?items=Auriol_BuitenTempSensor_BalkonWK&period=W" refresh=30000 visibil$
                    }
            }

I did change the url towards the https:/…:8443 but still doesn’t work. Pasting the url directly into the browser works without issues (both the http as well as the https).

The https definition however also shows an error in the log (‘2017-07-01 12:31:25.950 [WARN ] [org.eclipse.jetty.io.nio ] - javax.net.ssl.SSLException: Received fatal alert: certificate_unknown’).

So: everything works in the sitemap without issues or errors except for ALL of the images.

Does anyone have any clue???

Best regards, HWL