Title: ERR_HTTP2_PROTOCOL_ERROR
Last modified: February 16, 2022

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# ERR_HTTP2_PROTOCOL_ERROR

 *  Resolved [CDHeumann](https://wordpress.org/support/users/cdheumann/)
 * (@cdheumann)
 * [4 years, 3 months ago](https://wordpress.org/support/topic/err_http2_protocol_error-12/)
 * Hi. We just noticed that the downloads aren’t working and are throwing an error“
   ERR_HTTP2_PROTOCOL_ERROR”. Our hoster recently made various changes. In other
   threads I read that the problem can occur by switching from Apache to NGINX? 
   What can I try to fix the problem?
 * Edit: Hoster says: The website runs on an Apache but NGINX is upstream
    -  This topic was modified 4 years, 3 months ago by [CDHeumann](https://wordpress.org/support/users/cdheumann/).
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ferr_http2_protocol_error-12%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 4 replies - 1 through 4 (of 4 total)

 *  [Razvan Aldea](https://wordpress.org/support/users/raldea89/)
 * (@raldea89)
 * [4 years, 3 months ago](https://wordpress.org/support/topic/err_http2_protocol_error-12/#post-15371023)
 * Hello [@cdheumann](https://wordpress.org/support/users/cdheumann/) ,
 * Could you please go to dashboard > Permalinks and click Save without any modifications.
   After that, please go to Downloads > Settings > Advanced > Miscellaneous and 
   click Clear Transients and let us know if this worked for you.
 * Also, have you changed anything regarding the SSL?
 * Kind Regards,
    Razvan
 *  Thread Starter [CDHeumann](https://wordpress.org/support/users/cdheumann/)
 * (@cdheumann)
 * [4 years, 3 months ago](https://wordpress.org/support/topic/err_http2_protocol_error-12/#post-15371053)
 * Thanks for the very quick reply.
 * I’ve deleted the website cache same times, deactivated it, saved the permalinks,
   and do the clear transients.
 * But the Error is still there. I also tried it in different browsers.
 * The host says that SSL wasn’t affected by the changes and in the hosters dashboard
   everything is fine.
 *  [Razvan Aldea](https://wordpress.org/support/users/raldea89/)
 * (@raldea89)
 * [4 years, 3 months ago](https://wordpress.org/support/topic/err_http2_protocol_error-12/#post-15371088)
 * Coukld you please verify that in dashboard > Settings > General the `WordPress
   Address (URL)` and `Site Address (URL)` have `https` ?
 * An interesting thing is, [https://boerbenstriet.de/downloads/](https://boerbenstriet.de/downloads/)
   the first Download says it has secure connection problem and the later 2 can 
   be downloaded. Could you also check that the first Download ( ID 1392 ) has `
   https` protocol where you specify file URL?
 * Kind Regards!
    Razvan
 *  Thread Starter [CDHeumann](https://wordpress.org/support/users/cdheumann/)
 * (@cdheumann)
 * [4 years, 3 months ago](https://wordpress.org/support/topic/err_http2_protocol_error-12/#post-15371250)
 * I’ve found out that there seems to be a problem with the files that **don’t**
   have a “Forward to file” check mark.
 * The downloads without forwarding has for example this URL:
    [https://boerbenstriet.de/dl/Boerbenstriet_02-Mut_WEB.pdf](https://boerbenstriet.de/dl/Boerbenstriet_02-Mut_WEB.pdf)
 * The folder permission is 755 and the file permission 644
 * Site Adress and WordPress Adress have SSL.

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘ERR_HTTP2_PROTOCOL_ERROR’ is closed to new replies.

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 * 4 replies
 * 2 participants
 * Last reply from: [CDHeumann](https://wordpress.org/support/users/cdheumann/)
 * Last activity: [4 years, 3 months ago](https://wordpress.org/support/topic/err_http2_protocol_error-12/#post-15371250)
 * Status: resolved