F5 LTM: Failed to import SSL cert in PFX format

Hi All,

Any idea why F5 is throwing below error:

Import Failed: OpenSSL error:Exception caught in Management:urn:iControl:Management/KeyCertificate:pkcs12_import_from_filev2()

Exception:Common:OperationFailed
primary_error_code:-7 (PxFFFFFFF9)
secondary_error_code:0

error_string:error:06065064:digital envelope routines:EVP_DecryptFinal_ex:bad decrypt

Cert File format: FPX Import options: PKCS12 (IIS)