Localhost HTTP debugging with Fiddler

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21

Since v4.1 Commview also captures loopback traffic:
http://www.tamos.com/products/commview/

22

Hi, this thread is very helpful. I need to sniff and modify packets going to the localhost (i.e. 127.0.0.1) on a Windows Vista machine. I’m very new to this, so I would prefer not to change any hardware settings, etc. However, using the recommended tcptrace (from www.pocketsoap.com) was very easy. Is there a similar program that allows not just sniffing the loopback traffic but modifying it, too, preferably with an easy-to-use GUI that newcomers like me can use?

Thank you,
Dave

23

Oh, and I’m looking for a free version, if one is available.

Thank you,

24

Funny thing is that tracing SOAP on localhost is such a common requirement but capturing them on localhost is such a difficult task. I think wireshark should do something about it.

25

There is now a sniffer available for Windows that can sniff localhost / loopback traffic (i.e. to 127.0.0.1). The tool is called RawCap. RawCap is a command line sniffer that can capture network traffic to/from any interface on your computer that has an IP. It saves captured frames/packets to a pcap file that you can open with Wireshark or NetworkMiner.

You can read more about RawCap on my blog:
http://www.netresec.com/?page=Blog&month=2011-04&post=RawCap-sniffer-for-Windows-released

Good luck!