src/admin/setting/advanced.tpl
<div class="form-group">
<label for="cookiePath">Set path for session cookie</label>
<input class="form-control" id="cookiePath" type="text" placeholder="/path" data-field="cookiePath" /><br />
<p class="help-block">
Leave blank for default
</p>
</div>
src/middleware/index.js
if (meta.config.cookiePath) {
cookie.path = meta.config.cookiePath;
}
I just solved by adding cookiePath..
If there are better solutions, let me know! 
Hi I'm newbie.
What I'm trying to do is using multiple forum in a same domain.
I installed 2 nodebb in seperate directory with different port, different redis db.
and then set nginx.conf like below.
location /us/ {
proxy_pass http://127.0.0.1:4567/us/;
}
location /others/ {
proxy_pass http://127.0.0.1:4568/others/;
}
Now I can run 2 forums in same domain. However If I logged in the other forum's, session overwritten.
Is there any way that I can use seperate browser session using same domain different dir path?