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2446327 - SNC Error Code A221021D Server refuses offered key exchange algorithm


The error may happen in different scenarios:

1. Using SAP Single Sign-On or SNC Client Encryption to authenticate in the NetWeaver ABAP using SAPGUI.
2. Testing a RFC connection between two different systems in SM59 when SNC is enabled for this RFC.

On both cases, the error messaged raised is:

GSS-API(maj): Miscellaneous failure
GSS-API(min): A221021D:Server refuses offered key exchange algorithms target="SNC Name"



  • SAP Single Sign-On 2.0
  • SAP Single Sign-On 3.0
  • SNC Client Encryption 2.0
  • SAP NetWeaver ABAP


SAP NetWeaver Application Server for ABAP all versions ; SAP Single Sign-On 2.0 ; SAP Single Sign-On 3.0


keytab, strust, sapgenpse Client hello parameters: no algorithm fits server preferences, GSS-API(maj): Miscellaneous failure, SAPGUI, A221021D , KBA , BC-IAM-SSO-SL , Secure Login , BC-SEC-SNC , Secure Network Communications , Problem

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