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I try to add a certificate under "central administration>security>manage trust" but I always get the following error:

The Root Certificate that was just selected is invalid. This may be because the selected certificate requires a password and we do not support certificates that require a password. Please select another certificate.

It is a self created certificate.

More details here.

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up vote 25 down vote accepted

I figured it out: it does not work in Mozilla Firefox and Google Chrome. By using the internet-explorer (for entering the central administration and adding the certificate) everything work fine!

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Perfect.. It has helped me as well... Thank you for providing solution... – user34880 Aug 31 '15 at 8:48

One more piece to add to that answer... I was installing from the server's IE browser but was failing with this error. Did the exact same process from a client IE's browser and then it worked.

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