cannot use visual studio2015 for debugging

Question

cannot use visual studio2015 for debugging

立祥陳 1

We have developed a web site the addres of which is aaa.bbb.ccc/Form.aspx. When we debug the aspx.cs codes, we turned off the website in IIS and in property page of the solution in Visual studio (VS) 2015, we set the starting URL http://localhost:2222/. We clicked at the IIS Expreeess to debug the codes. In this case, a browser would automatically showed up. In the URL of the browser, it showed localhost:2222/Form.aspx and the webpage was shown for the debugging. This has been done for many years without any problem. Recently, we tried to debug the codes again using the same method. However, after the IIS Express button in VS2015 is clicked, the URL in the browser showed localhost:2222 first and all of a sudden it was changed to aaa.bbb.ccc. Then, we got an error message: unable to connect to aaa.bbb.ccc. We guess that the reason of the error message was that aaa.bbb.ccc had been turned off in the IIS. Of course it could not be connected. But the question is why the URL in the browser was changed to aaa.bbb.ccc as opposed to localhost:2222 as shown before. We did not change any setting. As a result, currently we are not able to debug the codes using Visual studio. Does anyone know what went wrong? how do we fix the problem?

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Answer 1

Tianyu Sun-MSFT 34,691 Microsoft External Staff

Hi @立祥陳 ,

Welcome to Microsoft Q&A forum.

Please right-click your web project > Properties > Web > and check if you set any Start URL.

Best Regards,
Tianyu

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立祥陳 1 Reputation point

2022-10-13T10:41:13.43+00:00

As we mentioned in our original question, we did set the start URL to http://localhost:2222/. It worked perfectly before. When we debug, the URL indeed is localhost:2222/Form.aspx. Just recently, the URL showed localhost:2222 as usual. but suddenly, it is changed to aaa.bbb.ccc and the error message showned up. We mentioned these events in our original question. The question is why the URL was changed to aaa.bbb.ccc. This did not happen before.
Tianyu Sun-MSFT 34,691 Reputation points Microsoft External Staff

2022-10-14T08:44:07.153+00:00

Hi @立祥陳 ,

I did some tests, but I couldn’t reproduce your issue. I am thinking if this issue is caused by cache, maybe browser cache? And was this URL(aaa.bbb.ccc) set in your project or one of your project files? If you change to use other browsers to debug, will the URL change? Besides, if you create a new web project, and set the start URL, will the same issue appear?
立祥陳 1 Reputation point

2022-10-15T00:38:52.337+00:00

thanks a lot for your good suggestions. We have emptied the cache of the browser. The problem still remains. The aaa.bbb.ccc is the web site address for a general user when the website is turned on in IIS. We used the same method to debug our codes before for several months. No any problem at all. Just recently, when we clicked the debugging button, a browser showed up automatically as usual. At this time, indeed the localhost:2222 was shown in the URL. Normally it should eventually show localhost:2222/Form.aspx (when it worked before) and we could easily debug. This is exactly what happened before when we could debug the codes. However, just recently, after the localhost:2222 was shown for about 2 seconds, it was changed to aaa.bbb.ccc automatically and the error message showed up. We guess only the developer of the visual studio can answer the question since other people do not really know under what condition the URL will be changed. The server supports several websites. The rest of the websites can still be debugged. No any problem at all. Therefore, we guess that it is not the problem of the server itself. There must be some reasons why the URL was changed to aaa.bbb.ccc suddenly. We also use exactly the way to debug our codes in other machine. No problem at all. We guess that the problem came from the fact that the URL was changed.
立祥陳 1 Reputation point

2022-10-15T00:48:42.47+00:00

Furthermore, I brought up my browser and entered "localhost:2222/Form.aspx" as the URL trying to force the contents of the URL. After a few seconds, the URL was automatically changed to aaa.bbb.ccc and the same error message was showed. Again we guess the problem is that for some reasons, the URL was changed mysteriously. Do you know what went wrong? In the same IIS in the server, other websites work perfectly (the URL was not changed) and could be debugged. We guess that the server as a whole should be OK. Thanks a lot for your help in advance.
Tianyu Sun-MSFT 34,691 Reputation points Microsoft External Staff

2022-10-17T09:44:06.13+00:00

Hi @立祥陳 ,

As I know, IIS(IIS Express) or codes control to redirect, if codes work well, then the issue should be caused by IIS Express.

I agree with you(the problem came from the fact that the URL was changed), but without changing anything, as VS, IIS Express both worked well before, I believe the cause is hidden in cache(IIS Express cache maybe).

You can reach out to VS product team on our Developer Community(DC), but, as DC is usually for issues about VS 2017, VS 2019 and VS 2022, you may use this .NET entry to report this issue.

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cannot use visual studio2015 for debugging

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