hi, first please make sure that the date, time & timezone are set correctly on your system. if this doesn't solve the issue (or it is already set properly), a solution depends on the individual circumstances:

• what is the error code shown when you click on advanced on that error page?
• please also give us more information about the error by clicking on the error code, copying the text to the clipboard and then pasting it here into a reply in the forum like shown in the screenshot.

thank you!

time and time zone settings are handled automatically, and seem to be right. When I click further, I see this:

thanks, then please click on the blue error message and copy the whole text into a reply here into the forum (like shown in my screenshot).

https://mail.google.com/mail/ca/u/0/#inbox

Peer’s Certificate issuer is not recognized.

HTTP Strict Transport Security: true HTTP Public Key Pinning: true

Certificate chain:

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thanks, it looks like a software product from http://netspark.com/ is intercepting your network traffic and you're therefore not connected to the original sites. if this is in a corporate environment and you're ok with that snooping, you can install and trust their cert in firefox which should make the sites load again: http://www.netsparkmobile.com/support/en/faqs/116-crt-en.html

Thanks for your help. Netspark provides the content filtering for my IPS, "Internet Rimon", this is an opt-in content filtering service. I already installed Rimon's certificate, and now, after installing Netspark's certificate as well (probably exactly the same thing) it still doesn't work. So I must speak to my ISP about it, thanks again for the help.

philipp said

thanks, it looks like a software product from http://netspark.com/ is intercepting your network traffic and you're therefore not connected to the original sites. if this is in a corporate environment and you're ok with that snooping, you can install and trust their cert in firefox which should make the sites load again: http://www.netsparkmobile.com/support/en/faqs/116-crt-en.html

Yeah, it turns out the certificate needs to be installed from a special webpage directly into the browser. It doesn't work to just run the certificate installer file, for some reason. Anyways, issue solved.