This solved the issue. Thank you.
After login i got query for 2factor. I enter the 2factor and then i got 502 error, 'forum is offline'.
That's the link i got for redirection -> https://domain/login/2fa?next=/categories
When i reload site all is ok. Any idea/hint for me?
Yes, it's annoying, I didn't realize that bug happened until recently, which is why 2factor is disabled on this forum.
That said, I think downgrading to node v14 would work.
But of course who wants to do that
The real fix is already in latest NodeBB
@julian If the fix is on the way, then I'll wait for the next release. Thanks.