I remove all sessions with db.sessions.remove({}) but now i can't logged in (403 Forbidden) also when i restart nodebb ?? but cookie domain was .domain.com now one step forward, one step backward.
Edit : loggin with Firefox works but not with chrome.
ReEdit : sorry clear cache solve it. So now i have the same cookie (.domain.com) in chrome debugger at forum.domain.com and app.domain.com. Thank you very much.

I don't understand, I've put .domain.com in that field (restart nodebb) but in chrome debug the cookie domain is still subdomaion.domain.com and my app does not access cookie ?

Yes the question is about session sharing. I want users logged in nodebb and reuse session in the other app. NodeBB as identity provider. Is nodebb-plugin-session-sharing intended for this purpose ?
In ACP > settings > advanced what does 'Set domain for session cookie' mean if we set '.domain.com' (with dot) ?

Hi, if my forum is forum.domain.com and another application is app.domain.com (same domain) is there a way to read express.sid set by nodebb from app.domain.com ? thank you.