D-Link DFL-1660 User Manual page 155

3.8.3. CA Certificate Requests
7. Back in the .pem file, locate the line that begins:
-----BEGIN CERTIFICATE-----
and copy into the system clipboard that line and everything under it, up to and including:
-----END CERTIFICATE-----
8. Now paste this copied text into the .cer file and save it.
The saved .key and .cer files are now ready for upload into NetDefendOS.
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Chapter 3. Fundamentals