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The root cause of the error is that the PFX file is encrypted by AES-256-CBC which is not supported by the current versions of DualShieldDualShield server with the framework versions older than Version 1.8.0.0906.
SOLUTIONS
There are 2 solutions.
SOLUTION
The quickest solution is to import the PFX file to the Windows Cert store, export it using "TripleDES-SHA1", then upload it to DualShield.
The second solution is to upgrade the DualShield Framework to the latest version.