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Thumbnails for particular files are not displaying on Commons, instead returning Error 429
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Description

For instance, https://commons.wikimedia.org/wiki/File:Island_of_Ireland_NASA.png and https://commons.wikimedia.org/wiki/File:Ada_Health_Symptom_Checker_conceptual_overview.png. https://upload.wikimedia.org/wikipedia/commons/thumb/b/ba/Island_of_Ireland_NASA.png/120px-Island_of_Ireland_NASA.png displays instead "Error
Our servers are currently under maintenance or experiencing a technical problem. Please try again in a few minutes.

See the error message at the bottom of this page for more information." and "If you report this error to the Wikimedia System Administrators, please include the details below.

Request from [my IP] via cp1080 cp1080, Varnish XID 157308863
Upstream caches: cp1080 int
Error: 429, Too Many Requests at Wed, 30 Aug 2023 18:08:12 GMT". Same for 189px and 379px wide thumbnails offered by https://commons.wikimedia.org/wiki/File:Island_of_Ireland_NASA.png . See also https://commons.wikimedia.org/wiki/Commons:Help_desk#File:Island_of_Ireland_NASA.png and https://commons.wikimedia.org/wiki/Commons:Help_desk/Archive/2023/08#Uploaded_image_appearing_broken .

Event Timeline

This appears resolved, either a correct or erroneous rate limit was being applied here. Please reopen if this is still an issue

The thumbnails at https://commons.wikimedia.org/wiki/File:Ada_Health_Symptom_Checker_conceptual_overview.png are still broken. "via cp1111 cp1111, Varnish XID 376415587
Upstream caches: cp1111 int
Error: 500, Internal Server Error at Sat, 30 Dec 2023 11:49:56 GMT"

The thumbnails at https://commons.wikimedia.org/wiki/File:Ada_Health_Symptom_Checker_conceptual_overview.png are still broken. "via cp1111 cp1111, Varnish XID 376415587
Upstream caches: cp1111 int
Error: 500, Internal Server Error at Sat, 30 Dec 2023 11:49:56 GMT"

This appears to be an unrelated issue (the error is 500 rather than 409). In testing it appears that there is a format issue with the source image that causes thumbnailing to fail. You may still encounter a 429 error subsequently as a result of repeated failures to render