That's what I discovered, BEANU. I couldn't sign in either. after trying some of the suggestions here, I discovered that the default value for the username (in phpMyAdmin) was 10 characters max. my original username was over 10 characters so it became clear that only the first 10 characters were saved. so go to your dolphin login page and simply just enter the first 10 of your username. also, the default value for the password is 32 characters max, it think. so if you're password is over 32, then see more you'll obviously have the same issue there. to change these values, log into your phpMyAdmin, select your database, select "admins". You'll see two fields for "name" and "password" and their corresponding types "varchar(10)" and "varchar(32)"edit the values there if needed. Hope this helps. It stumped my brother and I for a bit, and we reinstalled dolphin about 8 times between the two of us, thinking we had made a type somewhere. good luck!