We have a web application written in symfony framework (php). It works really well generally. However sometimes some users can not log in using internet explorer. If we clear the cookies / temporary internet files, then it allows you to log in.
A few months can pass by, and then the user using internet explorer won't be able to log in again.
This issue can also happen with people who are new to the site and have never logged in before.
I've searched for many hours, posted messages on forums and can not find the solution.
cAn anyone recommend links to help me debug this?