Tutorial :Monitoring traffic to Cassini on localhost


I'm experiencing some really odd timeout issues when running a ASP.NET 2.0 project on Cassini on localhost, and I don't have enough data to get a clue of what's going on.

Is there a way to monitor localhost traffic to Cassini, either using some specific development tool or a general-purpose monitoring app such as fiddler?

Just to pre-empt some answers I'm already aware of:

  • Normally I can use the well-known dot-hack for using fiddler to monitor localhost traffic, but with Cassini I get the following error message in the browser:

    [Fiddler] Connection to localhost. failed. Exception Text: No connection could be made because the target machine actively refused it ::1:3213

  • Fiddler also listens to localhost on http://ipv4.fiddler:port, and I can intercept the traffic. But when I do this the timeout issues don't occur!

Any other tools or fiddler workarounds welcome! Thanks!

Edit: Oops. This question had already been asked... Twice.. Didn't come up on search or suggestions. The solution found in the second thread is to use the dot-hack with ip-address ( instead of "localhost". This question may be closed.


You're generally better off using http://ipv4.fiddler as it makes it more explicit what you're trying to do.


While fiddler ignores requests to localhost, it listens to (note the trailing dot):

So this won't work:


But this will:


CassiniDev is an open source project that was developed to fill in all the blanks left by WebDev.WebServer/Cassini.

You will find this issue handled as well as many others.

It works well as a stand-alone server, as an in-process server suitable for testing and embedding and, most notably, as a direct replacement for the Visual Studio 2008/2010 dev servers.

alt text http://i3.codeplex.com/Project/Download/FileDownload.aspx?ProjectName=cassinidev&DownloadId=123367

alt text http://i3.codeplex.com/Project/Download/FileDownload.aspx?ProjectName=cassinidev&DownloadId=123366

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