I’ve installed NC 15.0.2 through the How to Install Nextcloud with Nginx and PHP7-FPM on CentOS 7 and it worked fine for some hours.

Then the error ERR_SPDY_PROTOCOL_ERROR returned in Chrome and Firefox, but not in Safari (MAC) so I cannot access the web application.

An important information is that on the same nginx I have NC and another web application (SuiteCRM).

How to fix this error and make NC working fine?

I have similar issue, although I am on shared hosting (OVH). I contacted their support and they replied that the problem is not from their side. What I noticed though is that NC works well on http as opposed to https. It seems that it is not charging correctly login and theme scripts under SSL. Any help is much appreciated.

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for OVH you have to edit the .ovhconfig file and change :


add_header Strict-Transport-Security "max-age=15552000;

Comment out this line in your nginx config will fix the problem