An image forming device comprising: a user operation acceptance unit configured to accept a user operation of entering account information of the user, the account information enabling the image forming device to sign in on a server, a transmission unit configured to transmit, to the server, device information for identifying the image forming device; a first establishment unit configured to: transmit to the server via the transmission unit, a sign-in request comprising the account information entered by the user and device information, the device information identifying the image forming device; and establish a connection with the server in response to receiving from the server an authentication result indicating that the image forming device has successfully signed in on the server; a termination unit configured to: terminate the connection with the server established by the first establishment unit; a second establishment unit configured to: receive from the server, a connection request along with the account information added to the connection request; transmit to the server via the transmission unit, the sign-in request comprising the account information added to the connection request and the device information; and establish a connection with the server in response to receiving from the server an authentication result indicating that the image forming device has successfully signed in on the server; an acceptance unit configured to accept a user instruction to terminate the connection with the server; and a notification unit configured to provide the server with a notification that requests the server not to issue the connection request, in response to the acceptance unit accepting the user instruction to terminate the connection with the server. a user operation acceptance unit configured to accept a user operation of entering account information of the user, the account information enabling the image forming device to sign in on a server, a transmission unit configured to transmit, to the server, device information for identifying the image forming device; a first establishment unit configured to: transmit to the server via the transmission unit, a sign-in request comprising the account information entered by the user and device information, the device information identifying the image forming device; and establish a connection with the server in response to receiving from the server an authentication result indicating that the image forming device has successfully signed in on the server; a termination unit configured to: terminate the connection with the server established by the first establishment unit; transmit to the server via the transmission unit, a sign-in request comprising the account information entered by the user and device information, the device information identifying the image forming device; and establish a connection with the server in response to receiving from the server an authentication result indicating that the image forming device has successfully signed in on the server; a termination unit configured to: terminate the connection with the server established by the first establishment unit; a second establishment unit configured to: receive from the server, a connection request along with the account information added to the connection request; transmit to the server via the transmission unit, the sign-in request comprising the account information added to the connection request and the device information; and establish a connection with the server in response to receiving from the server an authentication result indicating that the image forming device has successfully signed in on the server; an acceptance unit configured to accept a user instruction to terminate the connection with the server; and a notification unit configured to provide the server with a notification that requests the server not to issue the connection request, in response to the acceptance unit accepting the user instruction to terminate the connection with the server. receive from the server, a connection request along with the account information added to the connection request; transmit to the server via the transmission unit, the sign-in request comprising the account information added to the connection request and the device information; and establish a connection with the server in response to receiving from the server an authentication result indicating that the image forming device has successfully signed in on the server; an acceptance unit configured to accept a user instruction to terminate the connection with the server; and a notification unit configured to provide the server with a notification that requests the server not to issue the connection request, in response to the acceptance unit accepting the user instruction to terminate the connection with the server.