I am using magento enterpise. My Admin was not working suddenly.
If logged in with wrong username and password, It's showing "Invalid username/password", but when I tried to logged in with correct username and password(It was redirecting to the same login page).
It was worked for the past 1 year and I didn't do any changes in the server and I didnt apply any patches. Could you please help me in fixing the issue. I am using memcached(aws) for storing the sessions and redis for cache.