Uploading CA Certificates from Non-root CAs (BUI)
If your server certificate is signed by a non-root CA, you need to obtain
certificates for the second- and higher-level CAs also. After obtaining
these CA certificates, use the following steps to upload them.
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Go to Configuration > Settings.
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Click the System tab.
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Click the upload icon
.
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Browse to the signed certificate and select it.
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Click UPLOAD.
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Repeat steps 3 through 5 for each signed certificate.