After creating a security key, you should validate the key file to make sure it is not corrupt.
If the validation fails, do the following:
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If the security key identifier does not match the identifier on the controller, locate the correct security key file and then try the validation again.
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If the controller cannot decrypt the security key for validation, you might have incorrectly entered the pass phrase. Double-check the pass phrase, re-enter it if necessary, and then try the validation again. If the error message appears again, select a backup of the key file (if available) and re-try validation.
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If you still cannot validate the security key, the original file might be corrupted. Create a new backup of the key and validate that copy.