input: [Error Code] LogPotentialProxyNetwork Failure HTTP/1.1 400 Bad Request [Explanation] There may have been problems connecting to Google Apps through a network proxy. Note that proxies are not currently supported as a part of the Google Apps Sync tool. However, if all traffic is allowed on port 443 for Outlook.exe and ProfileEditor.exe then there should be no problems. [Relevant Links] 
output: System Requirements