You can extract the CA certificate using a web browser.
Procedure
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Using your web browser (Chrome or IE), navigate to the DSM user interface.
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Click the lock icon (Chrome) or the Certificate error (IE).
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Click Certificate Information (Chrome) or View Certificates (IE).
The Certificate Information window appears for both Chrome and IE browsers.
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Click the Certification Path tab.
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Select the certificate at the top. It starts with “CG CA (S) on ...”.
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Click View Certificate.
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Click the Details tab.
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Click Copy to File.
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Select Next, select Base-64 encoded X.509, and then click Next again.
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Specify a file name for the certificate.
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Click Next, and then click Finish.
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Locate and open the file you just saved with your favorite text editor. The content of the file should start with “-----BEGIN CERTIFICATE-----“ and end with “-----END CERTIFICATE-----“.
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Copy and paste the contents of this file to the 1.2.3.4_CA.pem file.
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Copy the 1.2.3.4_CA.pem file to CommServe machine.