|Some causes of this error in general for any web browser.||Misconfigured WordPress settings/plugins|
Issues with browser’s cache/cookies.
Issues with third-party services
Bad HTTPS settings
Bad server settings
Same here, can confirm this also happens in Edge, but I believe it's not really that common these days. The main site, however, sometimes throw a certificate error every once in a while.I have this address as a bookmark, from where I can log into the forum. The problem described by the OP, I have had regularly since at least the summer of 2021. In Edge, Chrome and Firefox, despite clearing cookies on exit, and daily clearing all temp files.