IPsec tunnel fails with the error "NO_PROPOSAL_CHOSEN" between openswan from a RHEL system and ibm lpar mainframe

Solution Verified - Updated -

Issue

When setting up an IPsec tunnel with openswan, the tunnel does not finish negotiation and gets the error: "NO_PROPOSAL_CHOSEN"

Environment

-Red Hat Enterprise Linux 6 with openswan
-IBM LPAR mainframe

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