cookies not found in codeignitor

What is the code you are using to write the cookie? What is the code you are using to try to read the cookie? Did you try setting the cookie_domain to '.your-domain.com'? Are you using the same time reference on your server and client?

The message 'Global POST, GET and COOKIE data sanitized' is a debug log message from the _sanitize_globals() method in CI's Input class. If your cookie's name or data uses certain characters, it may become unavailable to CI, but it shouldn't change its accessibility via JavaScript.

Bonfire

Practical CodeIgniter 3
CodeIgniter Testing Guide