Event Type: Error
Event Source: BizTalk Accelerator for HL7
Event Category: None
Event ID: 8706
Date:  20/08/2008
Time:  12:55:30
User:  N/A
Computer: IN12620
Description:
Unable to log message "An empty batch was received with fr..." to the event log due to exception:
"No connection could be made because the target machine actively refused it 127.0.0.1:4000".

Username: IN12620\BizTalk
Time: 20/08/2008 12:55:30

The issue, is obvious: The HL7 Logging Service is not running:

Read the complete post at http://blog.hl7-info.com/archive/2009/07/02/No_connection_could_be_made_because_the_target_machine_actively.aspx