SP-init flow issue with pre-existing SSO session with 12.8 CA SSO

Document ID : KB000111649
Last Modified Date : 20/08/2018
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Issue:
It appears that R12.8 policy server is not able to validate existing smsession cookie in SP Initiated Post transaction.

Policy Server trace logs
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[08/13/2018][09:57:49.227][09:57:49][532][139977941837568][AssertionGenerator.java][invoke][385fb99d-c4caacc3-b2480891-4285df97-2cb4af88-07][][][][][][][][][][][][][][][][][][][][Error in getting configuration data. Leaving Assertion Generator Framework. Exception: 
java.lang.Exception: The Federation Web Service didn't send the request with a correct resource! Internal Exception: 
java.lang.IllegalArgumentException: Input byte array has incorrect ending byte at 28 
 
Environment:
Policy Server: 12.8
OS: RHEL & Windows
Resolution:
Sustaining Engineering has created a devfix for this issue. Please create a support case and reference Engineering Case DE380366