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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