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I have received a certificate(pem-file)from Globalsign.
Do I have to combine this into a pkcs12 file first, or can I upload the pemfile from GSign right away ?
And, if there is something wrong with the certificate, how can I then access the controller thru GUI ?
You still have to combine it. Take a look at this link, it will expalin how to use a 3rd party certificate: