Finally the problems with my site are solved! My hosting provider discovered that the problem was caused by their firewall settings. Fortunately they were able – and willing – to make the necessary configuration changes. It was an awkward situation that my own plugin was no longer working on my own website. I’m glad it is all resolved now.
However, the event painfully pointed out that I should invest some time to investigate how I can rewrite the plugin to use the API instead of the RSS feed. Maybe in the near future…
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