Ok, I’ve got it.
Obviously I’m a victim of a new chrome security feature as described here:
To solve the problem it is possible to change the behavior of chrome in die windows registry as described here
or here
I’ve tried an entry in HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome\InsecurePrivateNetworkRequestsAllowed and everything was fine. In the next days I will try https connections, maybe changes in the registry are not necessary when using https.
Im wondering, why there are not more people affected by this feature. I’m using chrome version 96.0.4664.110. I think this issue affects all versions of chromium browsers, which explains my results with opera and edge while firefox was loading the images.
@matt1 Thank you, for your suggestions!
Regards,
Boris.