If admin, admin doesn't work try dragonadmin for user and password or admin on user and dragonadmin for the password.
If still doesn't work try to access the miner through telnet/SSH and change
Try this method from the link below.
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https://bitcointalk.org/index.php?topic=2455170.0If you can't log in with "username: root password: innot1t2" try other passwords (blacksheepwall, or t1t2t3a5)