Kibana 4.5.1 Fatal Error - unhandled courier request error: Request Timeout after 30000ms

I using elasticsearch 2.3.3 + Kibana 4.5.1
After start elasticsearch and kibana, go to browser to open kibana and receive this error bellow.

I try put in kibana.yml one great value to timeout elasticsearch but the erro persist.

My scenario is:

elasticsearch running localhost:9200
Kibana running localhost:5601
Nginx with proxy to localhost:5601, try to open kibana in my external ip and 5601 port, but same error

Fatal Error
Courier Fetch Error: unhandled courier request error: Request Timeout after 30000ms
Version: 4.5.1
Build: 9892

My nginx conf:

server {
    listen 80;
    location / {
        proxy_pass http://localhost:5601;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;        

Do things work without the nginx proxy? If so, you'll need to play around with your nginx config and see what's different between the request going directly from the browser to kibana, vs the request going from nginx to kibana.

Hi Bargs

Without nginx and with nginx.
I decide to migrate my ELK to new ELK 5 ALPHA to new version of ELK.
Is better dont loss my time to resolv this if in some days a new release get out.

Thabks bargs =)