PH06256: CWWKS1739E: A SIGNING KEY REQUIRED BY SIGNATURE ALGORITHM [RS256] WAS NOT AVAILABLE WHEN UPGRADING TO 18.0.0.3

APAR status

• Closed as program error.

Error description

• When upgrading to 18.0.0.3, OpenIdConnect clients might see
  the
  following error:
  CWWKS1739E: A signing key required by signature algorithm
  [RS256] was not available.
  
  followed by
  
  CWWKS1725E: The resource server failed to validate the
  access
  token because the validationEndpointUrl null was either not
  a
  valid URL or could not perform the validation.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All Users of IBM WebSphere Application      *
  *                  Server Liberty - OpenID Connect             *
  ****************************************************************
  * PROBLEM DESCRIPTION: CWWKS1739E error may occur when using   *
  *                      OpenID Connect in 18.0.0.3              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  In Liberty 18.0.0.3, when using OpenIdConnect you may see the an
  error like the following in messages.log:
  
  [11/15/18 16:33:55:696 EST] 0008f271
  .ibm.ws.security.openidconnect.client.jose4j.util.Jose4jUtil E
  CWWKS1737E: The OpenID Connect client [null] failed to validate
  the JSON Web Token. The cause of the error was: [CWWKS1739E: A
  signing key required by signature algorithm [RS256] was not
  available. ]
  
  followed by
  
  CWWKS1725E: The resource server failed to validate the access
  token because the validationEndpointUrl null was either not a
  valid URL or could not perform the validation.
  

Problem conclusion

• A NullPointerException in the JWKRetreiver class is causing this
  issue.  The JWKRetreiver class is updated to rectify the
  problem.
  
  The fix for this APAR is currently targeted for inclusion in fix
  pack 18.0.0.4.  Please refer to the Recommended Updates page for
  delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  LIBERTY PROF -

• Fixed component ID

  5655W6514

Applicable component levels

• RCD0 PSY

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