On Windows computers with Sophos installed, you may experience the problems described when using Firefox.
Workaround:
In the address bar in Firefox, type "about:config".
- Accept the risk and continue.
- In the search field "Search setting name" enter the following: security.tls.enable_0rtt_data
- Change the value from "true" to "false" (using the right button with the two half arrows).
- Close the browser tab, the settings have been applied.
- Restart Firefox.
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