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Symptom


When trying to do an Exchange backup you receive the error below.

Unable to backup vss document Protocol error, unrecognized message from agent Could not start SQLWriter service: Unable to open sevice handle: The specified service does not exist as an installed service September 05, 2012 5:22:30 PM CST - One or more devices failed replication Error replicating device D:\ (E089F999844B6554) Protocol error, expected block data stream Error replicating device (AE003F44003F3DB5) Protocol error, expected command response from agent Error replicating device C:\ (8C6055326040F3D5) Protocol error, expected command response from agent

Cause


This error is caused when the agent installed on the agent system is 4.0 as the Exchange protection was not released until 4.2.

Resolution


The resolution to this issue is to upgrade to 4.2.0 or higher.

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