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HttpTracer / ipInterceptor FAQ

Known Issues -
  • WinPCap has an issue on Windows 95 with a PPP connection. The only work-around is to upgrade, or use HttpTracer instead.
  • HttpTracer does not support NT Challenge Response. The work-around is to use ipInterceptor.
  • The security model of WinPcap is limited in the current version. At the moment, if you execute a WinPcap-based application for the first time since the last reboot, you must be administrator. At the first execution, the driver will be dynamically installed in the system, and from that moment every user will be able to use WinPcap to sniff the packets.
  • To use HttpTracer with HTTP 1.1, you should set your browser (under advanced) to USE HTTP 1.1 THROUGH PROXY CONNECTION, or disable HTTP 1.1 in your browser.
You will NEED to use HttpTracer:
  • If you do not have Administrator access on your workstation.
  • If you want to trace a PPP Connection on Windows 95.
  • If you do not want to install WinPCap.
  • If you want to trace the different phases of a conversation (ie. time to send data versus time to recieve data).
You will NEED to use ipInterceptor:
  • If you don't want to fiddle with changing your browser settings.
  • If you need to trace non-browser traffic.
  • If you need to trace UPD traffic.
  • If you don't want the overhead of a local proxy server.
  • If you need to see response time in Micro-Seconds.
  • If you are using NT Challange Response. This is not supported for HttpTracer.
How do I choose?
  • Download them both and see which one better meets your needs.
  • All users who registered HttpTracer prior to Jan 11, 2004, can get a free registration number for ipInterceptor by emailing Please provide your current registration number.
  • The following users will need to use HttpTracer:
How does HttpTracer?
  • HttpTracer is a local proxy server that runs on your workstation.
  • In order to make HttpTracer work, you need to set your browser to use a proxy, and then point it to your local IP ( If you don't want to fiddle around with changing your browser settings, you should consider using ipInterceptor.
How does ipInterceptor work?
  • ipInterceptor uses WinPCap (Open Source Sniffer) to capture all TCP and UDP packets that pass through the selected adaptor.
  • Winpcap_3_0.exe (included in the download) needs to be installed for ipInterceptor to work.
  • Unlike a lot of network sniffer programs, ipInterceptor is designed to meet the needs of of developer or QA engineer. Besides showing raw packets, it also re-assembles packets in a logical layout so that requests and responses are grouped together as conversations. The response times are for each conversation is then calculated based on packet timestamps.

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