The VIP ADFS plugin doesn't have sufficient rights to the VIP certificate being used for authentication. This is often caused by storing the VIP certificate in a folder where rights inherited from a folder or subfolder, preventing the cert from being properly accessed during VIP authentications.
Place the VIP Certificate downloaded from VIP Manager into the ADFS plugin installation folder. (i.e., C:\Program Files\Symantec\ADFS). Change the path of the cert in the VIP ADFS configuration tool.
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