I have the same error on a new installed Backuppc 3.3.0 under Centos 6.5, when 
trying to see Error Log of host. Backuppc is running.
Link is look like: 
http://ip/backuppc?action=view&type=XferErr&num=0&host=host-with-errors.

So, got: The gateway did not receive a timely response from the upstream server 
or application.
Apache/2.2.15 (CentOS) Server at ...

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