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    Suggestion 
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    Resolution: Not a bug
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    None
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    None
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    N/A
The RSS feed does not support HTTPS feeds. Confirmed that Thunderbird can access the feed while the same URL in Confluence results in an error.
— Error when accessing a test HTTPS feed —
rss: Unable to retrieve https://feed_url_here Could not download: https://feed_url_here - javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target 
— Error when accessing a test HTTP feed that serves HTTPS feed —
rss: Error parsing RSS feed: java.io.IOException: Invalid XML rssoutput-1798436319.txt 
- is related to
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                    CONFSERVER-7927 External authenticated RSS Feeds should be accessible with the {rss...} macro - Not Being Considered