Login to an S series switch fails due to password expiration after the switch rolls back from V200R001 to V100R006

In V200R001, S series switches (except S1700 switches) use a new encryption algorithm that is not supported by earlier versions. Therefore, when a switch rolls back from V200R001 to V100R006, you cannot log in to the switch using the password for login before rollback. To use the user name and password of the account for login before rollback, configure the user name and password on the switch again.

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