D-Link DNS-313 User Manual page 61

Section 3 - Configuration
A series of pop-up dialog boxes will warn you that the
secure connection failed. Since this connection is from a
trusted source on the LAN, you can make an exception
to the normal security certification. Click the Or you can
add an exception... button.
Click the Add exception... button.
Click the Get Certificate button.
D-Link DNS-313 User Manual 58