MySQL user has set password, but login can not fill in password

Just ready to do the MySQL read and write separation experiment, unexpectedly suddenly slave host slave_io_running state all become No

, from the morning until the afternoon can not find the reason, suddenly a thought, instead of using the empty password to try, incredibly come in, but I do not know why?

is registered on master:

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is logged in under slave:

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Workaround:

1. Attempt to modify the REPL user password failed.

2. Delete the REPL user and re-create the user. Success!!!
   

MySQL user has set password, but login can not fill in password