we had a project running very well in the testing server, once we move to the production server it says 500 internal server error.
there is no errors in php error log
in the iis we got this
2014-02-18 16:34:39 10.0.20.10 POST /McIntosh/Authentication - 80 - 220.127.116.11 Mozilla/5.0+(compatible;+MSIE+10.0;+Windows+NT+6.1;+WOW64;+Trident/6.0) 200 0 0 218
let me know if you need any details