I agree with Patrick, I think CommonCryptoLib is required for AES256-CTS-HMAC-SHA1-96 support, see SAP note 2004653 for details. Maybe you have downloaded and installed SAP Cryptographic Library on the Web Dispatcher which doesn't have support for the algorithm. You can increase the trace level, the library will spew out all the supported algorithms on start up. The information might be visible also in the Web Administration of Web Dispatcher, for example when creating a new PSE.
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