Login to Sentora master admin require password defined while setup...
Master admin login is zadmin. Master password have been displayed at the end of the Sentora installation and it is stored in file /root/passwords.txt
If you lost your zadmin password, you can reset it from the console. Login to your SSH console or open a console windows if you have physical access to your server, then type in:
setzadmin --set new-password
with new-password set as you want.
Use a mix of characters A-Z, a-z, 0-9 with no spaces. AVOID any single word or name, avoid any password length smaller than 8 characters.
Do not forget that the security of your server relies on it (and that you are legally responsible for its use !).