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I have an ASP.NET project (VS2008 on Windows 7 with either webforms, MVC1, or MVC2 -- all the same result for me) which is just the File->New hello world web project. It's using the default ASP.NET development server, and when I start the server with F5, the browser never connects and I get a timeout. I tried to debug this by telnetting to the development server's port while it was running, and I got the same result:

C:\Users\farmercs>telnet localhost 54752
Connecting To localhost...Could not open connection to the host, on port 54752:
Connect failed

I can see in the system tray that the server thinks it's running, and a netstat -a -n command shows that there is indeed an active TCP listener on that port.

This worked in the not-too-distant past, and I could work on web projects using the development server. One thing that has changed since then was that I installed the Microsoft Loopback Adapter to accommodate a local development Oracle installation. I'm not sure this is the problem, but it seems a likely culprit.

I also tried to hit the port using the server name itself (http://mycomputername:54752) but with the same result.

So, what could be blocking me from connecting? And if it's the loopback, then what is a good way for me to retain my ability to connect to my development Oracle server while still being able to use the ASP.NET development server?

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Chris Farmer
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1 Answers1

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have you checked your host file?

%SystemRoot%\windows\system32\drivers\etc\host

look if there is any redirection of localhost or 127.0.0.1 to somewhere else rather than your pc

Oscar Cabrero
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  • I'm embarrassed to say, but this was it. There was an entry to map localhost to 192.168.1.2. I just changed my VS project to use 127.0.0.1 instead of localhost, and it seems to work fine and the debugger attaches ok too. I am reluctant to change that hosts entry, since I have lots of configured oracle stuff now that I think would get upset if localhost changed its definition. Thanks for the help! – Chris Farmer Apr 05 '10 at 22:02