Because CER and CRT files are basically synonymous,they can be used interchangeably by simply changing the extension. So, in caseyour server requires you to use the .CER file extension, you can convert to.CRT extension easily by implementing the following steps:
Short Tip: Convert PEM files to CRT DER
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PEM files consist of the raw DER data converted into base64, a text-only format in which four text characters are used to encode every three bytes of binary data, thus sticking to plain ASCII and avoiding control characters, risky punctuation marks and so on.
I see that your screenshot for the same page on the Certificate Export Wizard has the option ticked instead and wondered if you could elaborate on this. Is this because of ADC 13 now being able to handle .pfx files natively (i.e. no need to convert to .pem)?
One of the security benefits of using an X509 PKI (as OpenVPN does) is that the root CA key (ca.key) need not be present on the OpenVPN server machine. In a high security environment, you might want to specially designate a machine for key signing purposes, keep the machine well-protected physically, and disconnect it from all networks. Floppy disks can be used to move key files back and forth, as necessary. Such measures make it extremely difficult for an attacker to steal the root key, short of physical theft of the key signing machine.
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