But now I have the problem that on the linked Confluence neither any JIRA macro nor the JIRA-gadgets are working.
The macros say I'm not authenticated and the gadget thinks there are no gadgets because the gadget feed and the gadget itself (<jira>/issues/rest/gadgets/1.0/g/feed) is not availbale anymore without separate authentication.
regardless your question is quite old now, I will answer it, as other users may find it. There is the possibility to allow specific url patterns for anonymous access by configuring a whitelist. You can create whitelist entries directly from the log of blocked requests, see the documentation for details.
Integrations with other Atlassian Tools are on the default whitelist and should work with current versions.
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