Cisco Cisco Hosted Collaboration Mediation 1.2 Troubleshooting Guide

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Solution 4
HLM is able to contact the PLM but PLM replies with 401 message.
Add the the PLM OS admin user id and password
Solution 5
HLM is able to contact the PLM but PLM replies back with an incompatible version.
Ensure the PLM release added is suported by the HCM-F by refering to the HCS compatiblity
matrix
Reference