How to solve ERR CONNECTION REFUSED when trying to connect to localhost running IISExpress - Error 502 Cannot debug from Visual Studio

Question

This is running on Windows Server 2008 and used to work several months ago   I am just now using this server again for some dev work with VS   This is live web server used to serve up a few test sites as well   This came up when running Visual Studio  then launching my projects for debugging   Trying to launch any site through localhost xxxx when IISExpress has been launched  using actual port   s in the config to access different sites    This webpage is not available  ERR CONNECTION REFUSED   I have been at this for a few days already  as I have read others have had similar issues  tried most things I have read including changing the managedruntimeversion from  v4 0  to  v4 0 30319  for  net 4 5  I have never had to do this before  and disabling the logging module  all suggestions found here    There are only two entries in my hosts file that point to internal server IP addresses   No localhost related IP s or references   I have gone as far as re-installing IIS Express  and Visual Studio 2013  I also created a brand new WebApplication site to try to resolve this  simple and no other complicated bindings    When I spin up Fiddler  I see the following on the page    Fiddler  The socket connection to localhost failed   ErrorCode  10061   No connection could be made because the target machine actively refused it 127 0 0 1 23162     I have removed all proxy settings from IE s LAN connection section  where before I was getting a red-x popup in VS indicating something like IISExpress could not launch   This is not a matter of SSL vs non SSL   I had TFS Server installed - uninstalled that in case there were some odd bindings that were interfering   I tried deleting the IISExpress config settings folder several times   Current applicationhost config contains    lt site name  WebApplication1  id  4  gt                   lt application path     applicationPool  Clr4IntegratedAppPool  gt                       lt virtualDirectory path     physicalPath  C  TFS-WorkRepository Sandbox WebApplication1 WebApplication1    gt                   lt  application gt                   lt bindings gt                       lt binding protocol  http  bindingInformation    23162 localhost    gt                   lt  bindings gt               lt  site gt               lt siteDefaults gt                   lt logFile logFormat  W3C  directory   IIS USER HOME  Logs    gt                   lt traceFailedRequestsLogging directory   IIS USER HOME  TraceLogFiles  enabled  true  maxLogFileSizeKB  1024    gt               lt  siteDefaults gt               lt applicationDefaults applicationPool  Clr4IntegratedAppPool    gt    I wish there was a tag for really-stuck   Please suggest away  as I don t want to go as far as spinning up a new server   -- UPDATE --  In the URL bar  when I enter the computer name or IP address  xxxx I get the ERR CONNECTION TIMED OUT rather than ERR CONNECTION REFUSED

User · Accepted Answer

Try changing the port number in your project?

Project Properties ? Web ? Servers ? Project Url:

Don't forget to click Create Virtual Directory, or reply "Yes" to the prompt for creating virtual directory after you change your port number! (Thanks Connor)

Note: I'm a little reluctant to post this as an answer, as I have no idea what the issue is or what caused it, but I had a similar issue, and changing the port number did the trick for me. I'm only posting this per the suggestion in the comments that this worked for someone else as well.

In my case, it seemed like something was conflicting with the specific port number I was using, so I changed to a different one, and my site popped right back up! I'm not sure what that means for the old port number, or if I'll ever be able to use it again. Maybe someone more knowledgeable than myself can chime in on this.

User · Answer

I ve just fixed this for my machine  Maybe it will work for some  Maybe not for others  but here is what worked for me   In IIS  I had to add bindings for https to the default website  or  I suppose  the website you are running the app under      Now my localhost works when debugging from Visual Studio

User · Answer

In my case it was caused by starting IIS with no administrative rights  When I launched IIS as admin and started the site it worked fine

User · Answer

Sam s solution worked for me  but I didn t want to run as admin as a permanent solution   This is how I solved it in my case    Run CMD as admin Type  netsh http show urlacl  and find the reserved url with the relevant port Type  netsh http delete urlacl url YourReservedUrlHere    After that I could run my app without the need for admin rights  But it did messed with the ability to browse to my app from an external computer  Close enough for me for now

User · Answer

A simple work around it worked for me  is use the IP address instead of localhost  This should be fine for your development tasks

User · Answer

I had the same problem  I tried these steps     Closed the Visual Studio 2017 Removed the  solutionPath  vs config applicationhost config Reopened the solution and clicked on  Create Virtual Directory  Tried to run    ERR CONNECTION REFUSED FAILED   Another try     Closed the Visual Studio 2017 Removed the  solutionPath  vs config applicationhost config Removed the   Documents IISExpress config applicationhost config Reopened the solution and clicked on  Create Virtual Directory  Tried to run    ERR CONNECTION REFUSED FAILED   Another try    Closed the Visual Studio 2017 Removed the  solutionPath  vs config applicationhost config Removed the   Documents IISExpress config applicationhost config Added   127 0 0 1       localhost to C  Windows System32 drivers etc hosts Reopened the solution and clicked on  Create Virtual Directory  Tried to run    ERR CONNECTION REFUSED FAILED   WHAT IT WORKED    Close the Visual Studio 2017 Remove the  solutionPath  vs config applicationhost config Start  Manage computer certificates  and  Locate certificate  localhost  in Personal-  Certificates  Remove that certificate  do this on your own risk  Start Control Panel All Control Panel Items Programs and Features Locate  IIS 10 0 Express   or your own IIS Express version  Click on  Repair   Reopen the solution and clicked on  Create Virtual Directory  Start the web-project   You will get this question   Click  Yes  You will get this Question    Click  Yes  Now it works

User · Answer

Ensure Script Debugging is disabled    I was getting this intermittently despite having tried several of the above suggestions  As soon as I disabled this  my debugging my site worked like a dream   Think I d only turned it on by accident  or perhaps in a previous life

User · Answer

I ve solved by going to Project Properties -  Debug  after enable SSL and use the address in your browser

User · Answer

I recently encounter this issue when I copy the source code from another machine   -  Delete the  vs folder  it is hidden folder  so make sure you have enable view hidden folder option  -  open visual studio and build your project  Visual studio will create new  vs folder as per current system configuration

User · Answer

Rebuild All worked for me  VS2013  IIS Express

User · Answer

While probably not related to your problem  I had the same issue today  As it turns out  I had enabled an URL Rewrite module to force my site to use HTTPS instead of HTTP and on my production environment  this worked just fine  But on my development system  where it runs as an application within my default site  it failed    As it turns out  my default site had no binding for HTTPS so the rewrite module would send me from HTTP to HTTPS  yet nothing was listening to the HTTPS port    There s a chance that you have this issue for a similar reason  This error seems to occur if there s no proper binding for the site you re trying to access

User · Answer

Thanks for all the answers  I tried all of them but none of them worked for me  What did work was to delete the applicationhost config from the  vs folder  found in the folder of your project solution  and create a new virtual directory  Project Properties   Web   Create Virtual Directory   Hope this will help somebody else

User · Answer

I solved this problem by starting Visual Studio with Run as administrator   This is also required if you want to publish your project to the local IIS   To set this permanently -   Right-click on the Visual Studio icon Select Properties Click Advanced Ensure Run as administrator is checked-on Click on OK all the way out  Start Visual Studio  load your project and start debugging

User · Answer

If you are using  real  IIS  this can occur if the W3SVC  World Wide Web Publishing  service is stopped   Should seem obvious but if you accidentally stopped the service or have it set to manual this could happen to you   I know the title says IIS express however google doesn t seem to filter out the express even when using a -Express hint so hopefully this helps someone else who found this page instead of an IIS-specific one

User · Answer

I was simply trying to Bind IP with IIS but ended up messing with IIS config files I literally tried 20  solutions for  this  which includes    vs file deletion of a project solution IIS folder config file deletion IIS folder deletion VS2019 Updation VS2019 repair Countless times machine and VS restart various commands on CMS various software updates Various ports change   but what worked which may work for someone else as well was to REPAIR IIS from   Control Panel Programs Programs and Features   Else you can refer to this answer as well

User · Answer

In my case  my co-worker changed the solution name so that after I get latest version of the project  I run my web application with IIS EXPRESS  then I got the message ERR CONNECTION REFUSED in my google chrome   After I try all the solution that I find on the internet  finally I solved the problem with these steps     Close VS Delete the  vs folder in the project folder  Run As Administrator VS Open Debug    Your Application  Properties   Web Change the port in Project URL and don t forget using https because in my case  when I m using http it still did not work   Click Create virtual directory Run the application again using IIS EXPRESS  And the web application ran successfully    Hope these helps

User · Answer

This may be relevant to a certain subset of people with this issue   perhaps in a different flavor   I was forcing an https redirect on RELEASE   public static void RegisterGlobalFilters GlobalFilterCollection filters      filters Add new HandleErrorAttribute        if  DEBUG   filters Add new RequireHttpsAttribute        endif         And there wasn t https enabled on my iis express  Working correctly on DEBUG

User · Answer

In my case  it was caused by an infinite loop stack overflow

User · Answer

This issue may be because in the recent past you have used IP address binding in your application configuration   Steps to Solve the issue     Run below command in administrator access command terminal      netsh http show iplisten   If you see some thing like below then this solution may not help you       IP addresses present in the IP listen to list       0 0 0 0   If you see something different than 0 0 0 0 then try below steps to fix this    Run following shell command in order with elevated command terminal      netsh http delete iplisten ipaddress 11 22 33 44      netsh http add iplisten ipaddress 0 0 0 0      iisreset     Here 11 22 33 44 is the actual IP that needs to be removed    And now your issexpress is set to listen to any ping coming to localhost binding

User · Answer

Make sure you have a start page specified  as well  Right click on the  aspx page you want to use as your start page and choose  Set as start page

User · Answer

I tried a lot of methods on Chrome but the only thing that worked for me was   Clear browsing data   Had to do the  advanced  version because standard didn t work  I suspect it was  Content Settings  that was doing it

[visual-studio] How to solve ERR_CONNECTION_REFUSED when trying to connect to localhost running IISExpress - Error 502 (Cannot debug from Visual Studio)?

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