I have a problem with a client, who cannot log in to our system. We have PHP-based B2B system, which uses cookies to store session-id.
The client cannot log in and is redirected to the login page, without any error message. He claims he have cookies enabled in his Firefox. Also, if he had cookies disabled, my javascript would detect this and would show him an red, very descriptive error info. He does not seen anything like this.
What else could have same effect on sessions like disabled cookies in browser?
Are there any proxies which filters cookies? Any AV software, etc? What to look for?
Our login form works for any other user without problems.
Update:
I can see in logs, that the guy have logged in successfully, but I don’t know yet what was wrong. I will update when I know more.
Update #2:
I called the man. It seems that it was some NOD32 antivirus settings, that caused problems, but the man could not tell me details. He called a guy from tech department and the guy soleved the problem.
Anyway, thank you all for responses.
The problem was probably in the settings of NOD32 antivirus, but I do not know the details.