SSH connection fails to sshd server with enabled ibmca engine

Solution In Progress - Updated -


  • On IBM Z the current openssh implementation might show an issue regarding elliptic curve (EC) algorithms when used in conjunction with cryptographic adapters for acceleration of clear key cryptographic commands. The problem surfaces when the ibmca engine is used to register EC algorithms with openssl, either in respective openssl.cnf file sections or by request on the command line.


  • Red Hat Enterprise Linux(RHEL) 7.x
  • IBM System Z / S390x

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