On October 19, 2021, we have enabled single-sign-on for our Plesk Support Center to provide a seamless login/account experience. This implies that you’ll be able to use a single account across any of our web-facing properties.
If you had already registered your account at Plesk 360 (formerly known as My Plesk) please use one for login. Otherwise please re-register it using the same email address as your existing Zendesk login (support account). It’s essential that you use the same email address on our support center to ensure that your tickets stay attached to the same account.

Articles in this section

See more

Cannot access Plesk-hosted website on iOS or Mac devices: The operation couldn’t be completed. Protocol error

Avatar
Stefan Yakubov
Updated
Follow
Plesk for Linux kb: fixed kb: bug

Applicable to:

  • Plesk for Linux

Symptoms

  • On iOS/MacOS devices, when accessing a website a blank page is shown or the following error is shown:

    CONFIG_TEXT: The operation couldn’t be completed. Protocol error

  • Nginx is configured as proxy server in Domains > example.com > Apache & nginx settings > Proxy Mode

  • Accessing a website from Debian/Ubuntu command line returns an error similar to below one:

    # curl -vvv -k -L -I example.com
    * http2 error: Invalid HTTP header field was received: frame type: 1, stream: 1, name: [upgrade], value: [h2,h2c]
    * HTTP/2 stream 0 was not closed cleanly: PROTOCOL_ERROR (err 1)
    * stopped the pause stream!
    * Connection #1 to host example.com left intact
    curl: (92) HTTP/2 stream 0 was not closed cleanly: PROTOCOL_ERROR (err 1)

Cause

Product issue:

  • #PPPM-12381 "It is now possible to open websites and webmail in Safari when HTTP/2 is enabled in both nginx and Apache."
    Fixed in:

Resolution

Please consider updating your server:

Workaround

In Plesk environment configuration where http2 is enabled both for Apache and Nginx is not supported: when Nginx acts as a proxy, it only interacts with the browsers.

To work around this issue, consider one of the following options:

Click on a section to expand

Disable http2 module in Apache
  1. Log in to Plesk GUI
  2. Go to Tools & Settings > Apache Web Server > Disable the module http2 > Click OK to apply the changes
Modify Nginx header configuration

  1. Connect to the server via SSH

  2. Run the following command:

    # echo "proxy_hide_header upgrade;" > /etc/nginx/conf.d/safari_fix.conf && systemctl restart nginx

Comments

1 comment

Sort by Date Votes

Please sign in to leave a comment.

Have more questions? Submit a request

Related articles