Title: Gutenberg “Preview Button” Not Loading – “Generating Preview…”
Last modified: April 29, 2019

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# Gutenberg “Preview Button” Not Loading – “Generating Preview…”

 *  [Elliot Sowersby](https://wordpress.org/support/users/elliotvs/)
 * (@elliotvs)
 * [7 years, 1 month ago](https://wordpress.org/support/topic/gutenberg-preview-button-not-loading-generating-preview/)
 * Hello
 * We’re having an issue with the “Preview” button on Gutenberg just stuck “Generating
   Preview…”
 * See video clip here: [https://i.gyazo.com/75e6d3c723cf305002c5e7c81d87ec7b.mp4](https://i.gyazo.com/75e6d3c723cf305002c5e7c81d87ec7b.mp4)
 * The website is using an “IIS reverse proxy”.
 * I’ve looked at a few posts etc on here and Github, that shared some suggestions/
   fixes, mainly caused by Cloudflare reverse proxy, however none of these solved
   it.
 * The main suggestions are:
 * **(1) Clear the reverse proxy cache.**
    The cache on our IIS reverse proxy is
   cleared automatically every 5 minutes.
 * **(2) Make sure the server IP and your own IP addresses are whitelisted.**
    “
   We don’t blacklist/whitelist anything on the reverse proxy so there is no whitelist
   to add to.”
 * It is also not a plugin/theme conflict, since a duplicate of the site onto a 
   staging server, without the reverse proxy works fine.
 * Does anyone have any other suggestions to fix this?
 * Cheers!

The topic ‘Gutenberg “Preview Button” Not Loading – “Generating Preview…”’ is closed
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 * 0 replies
 * 1 participant
 * Last reply from: [Elliot Sowersby](https://wordpress.org/support/users/elliotvs/)
 * Last activity: [7 years, 1 month ago](https://wordpress.org/support/topic/gutenberg-preview-button-not-loading-generating-preview/)
 * Status: not resolved