Certificate Size and Format
The format of the certificate must be base64-encoded. You must include the private key and the certificate in the upload. Please note that uploading the private key this way might be intercepted by an intruder. You can minimize this risk by using the localhost address from the local machine.
In order to provide the key, just enter the ASCII string that you received from the trusted party, copy it into the text field, and press Save. The system will then present this certificate to HTTP and SIP connections that require secure communications.
If your private key starts with something like this, you need to first decrypt the key before you copy & paste it into the web interface:
-----BEGIN RSA PRIVATE KEY----- Proc-Type: 4,ENCRYPTED DEK-Info: AES-256-CBC,E687456BA4F7D6621A98B011FA2EE4D7
You can do this using the command "openssl rsa -in server.key.secure -out server.key" (for this you need to have OpenSSL installed).