Allied Telesis IE200 Series Industrial Ethernet Switches come with default manager credentials. Since this requires physical access by plugging into the RS-232 port this is low risk. But many orgs feel that security is all that is needed and don’t change the defaults! These credentials are good on the following switch models according to the manual published on September 30, 2014:
Enter the username and password to log on the switch. If this is the initial management session of the switch, enter “manager” as the user name “friend” as the password. The user name and password are case sensitive.