It is common for people not to know the default username and passwords of devices especially now that most devices are considered “plug and play”. With this, most people does not feel the need to open and actually read the manual just like me!
For the MFC-9120CN using the BRAdmin light, click on the network navigation icon
A new window will open asking for the password, type access
this will allow you to configure your Brother printer.
For configuring using your web browser the default username and password is as follows:
Username: admin
Password: access
Enter a password if you have a brother printer, the default password is – “access” or default password – “initpass” and your username – “admin”. This is the password for common brother printers and there are not many printers in it.
Learn: http://www.printersupportplus.com/brother-printer-default-password
I don’t have a brother printer with me at the moment so I cannot verify this one but please do try and let us know if it works