Brother HL 4040CN - Manual (Page 145)

Security features
138
12
d
Type https://printer_ip_address/ into your browser to access your printer. (Where
printer_ip_address
is the IP address or the print server name) Then, click Continue to this
website (not recommended).
e Click Certificate Error, and then click View certificates.
f
Choose the Details tab, and then click Copy to File....