trouble with facebook, google SSO on sub domain

[ajay]

I was hosting nodebb on startupmachine.co earlier and everything worked fine
now I have moved it to forum.startupmachine.co and my facebook SSO started failing.
Facebook gives error:
Internal error.
Oops! Looks like something went wrong!
/auth/facebook/callback
Error validating verification code. Please make sure your redirect_uri is identical to the one you used in the OAuth dialog request

I replaced site URLs with forum.startupmachine.co everywhere
I am using EC2 Ubuntu with nginx
EDIT: google and twitter are working

[julian]

@ajay What is your url set to in config.json?

[ajay]

sorry for late reply
it is :
http://forum.startupmachine.co

[julian]

... and what is the redirect uri set to in Facebook? They can be very stingy about this, it must match exactly, character for character.

[ajay]

I tried lot of things for redirect uri

could u tell what should I enter
here are settings which I have kept
appdomain: startupmachine.co
site_url - forum.startupmachine.co
redirect_uri: forum.startupmachine.co
but i tried lot of things in all of these fields (spent a whole night with all combinations )

[Macrow Willson]

same here:
Internal error.

Oops! Looks like something went wrong!

/auth/facebook/callback
Error validating verification code. Please make sure your redirect_uri is identical to the one you used in the OAuth dialog request

dev-version @ master. I tried also all sorts of combinations, my url is http://forum.x4dojo.org and I entered http://forum.x4dojo.org and http://forum.x4dojo.org/auth/facebook/callback as valid redirect urls.

[Macrow Willson]

@Macrow-Willson , ah setup: apache,debian,mod_proxy