This is a common issue which stems from confusion in the password change process. Here is what happens:

1.) On logging in you are prompted for your temporary password. Entering it this first time logs you in.
2.) Now that you’re logged in the password reset process is started automatically. The first thing it does is verify your current (temporary password). You need to enter your current password a second time. If you do not enter the password correctly here you are logged off with the connection closed message.
3.) Now you are prompted to enter a new password twice.