I have recently bought a raspberry pi, and I have installed raspbian on it. I decided to change the default password, but after that every time I tried to login to ssh, it said permission denied. I tryed to change the password again, but it said invalid password. The only way I could change the password was with sudo. After that it worked a while but the next day it said invalid password again! I have no idea why it keeps changing but I need it to stop. Any ideas?Also, I have enabled ssh through raspi-config