Cakephp subdomain ajax requests failing 500 Internal server error

I am working on a CakePHP 开发者_运维知识库application where I create a sub domain via routing. Everything was working fine but suddenly the Ajax requests for Facebook & Twitter API calls are failing with

NetworkError: 500 Internal Server Error

We have implemented subdomains for which we have used session.cookie_domain to share the session ( session cookies) among the subdomains (created virtually), which points to the profile page of each User.

Previously it was working fine; but after we implemented this session sharing among the sub domains, it began to give us this error.

Can anyone help?

Make sure your redirect/callback URL for both Twitter's and Facebook's API calls are being sent to a single "static" URL not the user specific subdomain.