After firmware update Standard/Pro to the v2.17.0.23 log in failss

Why does it fail to log in on MyPBX web interface after updating MyPBX Standard/Pro to the firmware version 2.17.0.23?

In order to enhance the security of MyPBX system, the firmware version 2.17.0.23 of MyPBX Standard/Pro changed the encryption for the web GUI login.