LibreWolf SEC_ERROR_OCSP_SERVER_ERROR

[DD8372812]

• [x ] I have searched open and closed issues for duplicates
• [ x] This isn't a feature request
• [ x] This is not a report about my app not working as expected

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Hello Proton developers,
I'm trying to use the firefox add on to connect with Proton VPN Service but I can't establish a valid connection to any site. Login is OK but browsing doesn't work. I get the message "Error code: SEC_ERROR_OCSP_SERVER_ERROR" while opening any site.

Are there any ports to open besides 4446?
Is LibreWolf the problem?

Thanks for your help.