Image forming device transmitting data for displaying authentication changing web page

An image forming device comprising:

• a memory;
• a communication interface;
• and
• a computer configured to function as a web server that enables the communication interface to communicate with a browser running on a terminal, the computer being configured to further perform:
• receiving authentication information inputted to the terminal;
• determining, on the basis of the inputted authentication information and current authentication information, whether to permit use of the web server by the terminal;
• in a case that the use of the web server has been permitted, determining whether the current authentication information matches initial authentication information,
• in a case where it is determined that the current authentication information does not match the initial authentication information and the use of the web server by the terminal has been permitted:
• transmitting, as the web server, data for displaying a specific web page to the terminal, the specific web page being for receiving an operation to issue a first instruction related to an image forming process;
• receiving the first instruction from the terminal;
• and
• in response to receiving the first instruction, a process according to the first instruction;
• and
• in a case that it is determined that the current authentication information matches the initial authentication information and the use of the web server by the terminal has been permitted:
• transmitting, to the terminal, data for displaying an authentication changing web page, the authentication changing web page being for receiving new authentication information to issue a second instruction to update the current authentication information using the new authentication information;
• receiving the second instruction from the terminal;
• and
• in response to receiving the second instruction, updating the current authentication information in the memory using the new authentication information according to the second instruction,
• wherein regardless of whether an authentication information update process has been executed for the current authentication information, in a case that the current authentication information matches the initial authentication information and the use of the web server by the terminal has been permitted, an instruction related to the image forming process is not accepted by the computer from the terminal.