Why and how to fix IIS Express The specified port is in use

Question

We know a random port number is assigned to a web application in Visual Studio  It works fine in my office desktop  But when I pull the code onto my laptop  from VisualStudio com  and run the web app  I got a message  saying   The specified port is in use  Port 10360 is already being used by another application   Recommendations   Try switching to port other than 10360 and higher than 1024  Stop the application that is using port 10360      I can fix it using Recommendation  1 by changing the port into something else like 13333  But I am very curious what happened to port 10360  How can I check what application is using port 10360  How can I stop that application

User · Answer

For me the  The specified port is in use  error is usually fixed  well actually worked arround  by stopping the  Internet Connection Sharing  ICS    SharedAccess  and the  World Wide Web Publishing Service   W3SVC  service    After the project   ISS Express is started the stopped services can be started again without issues   Whenever i receive the error the port  in the 50000 range  is definitely not in use  checked with netstat  amp  tcpview    It would be nice if Microsoft did some integration testing of Visual Studio   IIS Express along side with HyperV and the  normal  IIS Service OR gave some guidance on which port ranges to use for VS   IIS Express  and which ports to avoid

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netstat didn t show anything already using the port  netstat -ano   findstr  lt your port number gt  showed nothing for me  I found out that port was excluded using this command to see what ranges are reserved by something else   netsh interface ipv4 show excludedportrange protocol tcp  You can try to unblock the range from the start port for a number of ports  need Command Prompt with Administrator    netsh int ip delete excludedportrange protocol tcp numberofports  lt number of ports gt  startport  lt start port gt   However  in my case I couldn t unblock the range  I just got  Access is denied   so I ended up having to pick another port for my site   My original solution  The only thing that worked was deleting the  vs folder in the solution folder   I ve since found you can just delete the  vs config applicationhost config instead to avoid losing so many settings

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click on the notification present on bottom of the task bar if you receiving the error like port in use then select the iiss icon right click then click on exit  it work like charm for me

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You need to configre this parameter by running the following in the administrative command prompt      netsh http add iplisten ipaddress

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Close the VS   Start again - right click and run as admin Run your project again

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For me  the Google Chrome browser was the process which was using the port  Even after I closed Chrome  I found that the process still persisted  I allow Chrome to  run in background  so that I can receive desktop notifications   I went into Task Manager  and killed the Chrome browser process  and then started my web application  it worked like a charm

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SIMPLE SOLUTION THAT WORKED FOR ME   Credits to combination of other s answers    My System Info    Windows 10 build   1809 IIS Version        10 0 17763 1 Hyper-V            Enabled Docker             Installed - 2 3 0 2  45183    Check for blocked ports range in CMD  admin   gt  gt  netsh interface ipv4 show excludedportrange protocol tcp   Sample output   Protocol tcp Port Exclusion Ranges Start Port    End Port ----------    -------- 49696       49795          SEE HERE  49796 to 49895 is not blocked  49896       49995     list goes on       Open Visual Studio and Navigate to  gt  Project  gt  Properties  gt  Web  gt  Servers  gt  Project Url  Use the Port that is not blocked   Sample port   http   localhost 49796    Restart Visual Studio  if required   Have a coffee and share love   required

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This was haunting me for over a year   For me     no website was running iin IIS Express nothing was using the port as determined by running  netstat -ano at the command line     The solution was to run   netsh http add iplisten ipaddress      from the command line   Happy days  and credit to  James Bryant  https   developercommunity visualstudio com content problem 110767 specified-port-is-in-use html

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Visual studio 2015    Close all the files you have open inside Visual studio   Then close application and exit Visual Studio  Open Visual Studio and it should successfully run    I hope this helps

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i solve the problem this way    File - gt  Open - gt  Web Site     After that select Local IIS  under IIS Express Site remove the unwanted project  hope this help

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For me  close all application and restart the computer    When window start  Open Visual studio first  then open browser and click run F5    Now it works  I don t know why

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To Solve this issue follow the below step    Open the CMD run as Administrator mode   Then execute the command netsh http add iplisten ipaddress    After run the project

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For me only thing worked is removing the  element containing my application name  path and binding info under  lt  system applicationHost gt  element in applicationhost file  To be found under C  Users yourUsername Documents IISExpress config Closed the the solution   deleted the bad site element   save the applicationhost file and close  Reopen the application Website from Visual studio using Admin rights - Rebuilt and Run  Voila    A new port is auto assigned to your application which solves the purpose  Can also be verified without running-- check the Properties window for the solution and URL will have new port number

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Running visual studio in administrative mode solved my issue

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Open your csproj with for example Notepad    and scroll down to DevelopmentServerPort  Change it to something else as long as it s above 1024 like rekommended  so for example 22312   Also change the IISUrl to http   localhost 22312   Save your changes and restart the project

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If netstat doesn t show anything  try a reboot   For me  nothing appeared in netstat for my port   I tried closing Google Chrome browser windows as  Clangon and  J T  Taylor suggested  but to no avail   In the end a system reboot worked  however  so I can only assume that something else was secretly holding the port open   Or perhaps it just took longer than I was prepared to wait for the ports to be released after Chrome shut down

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Just to add to this  I had the full IIS feature turned on for one of my machines and it seemed to cause this to happen intermittently   I also got random complaints about needing Admin rights to bind sites after a while  I assume that somehow it was looking at the full IIS config  Which does require admin as it s not a per-user file    If you are stuck and nothing else is helping  and you don t want to just choose another port  then check you have removed this if it is present

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change it in solution  right Click  -  property -  web tab Click Create Virtual Directory  in front of project Url textbox

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In Visual Studio 2017  select Project Properties and then select the Web option  In the IIS section next to the default project URL click Create Virtual Directory  This solved the problem for me  I think in my case the default project Virtual Directory had been corrupted in some way following a debugging session

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In my case there was no application using specified port and elevated running of Visual Studio didn t help either   What worked for me is to reinstall IIS Express and than restart computer

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Open Task Manager and Just Close all processes of  IIS Express System Tray  and  IIS Express Worker Process  and Re-run the Project

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For me it was an orphaned VBCSCompiler task from a previous run  that didn t shut down and was somehow interfering  Killing that task solved it   https   developercommunity visualstudio com content problem 31482 vbcscompiler-does-not-shut-down html

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In my case I got also this issue from my ASP Core 3 1 projets  I thing that for some reason visual studio ignore the IP Port setting in the project property and start it on 5000 and 5001  I discovered this while attempting to start my Core 3 1 projects from prompt using dotnet run And this post helped me How to specify the port an ASP NET Core application is hosted on  It suggest to  Specify the port in the appsettings json or maybe appsettings development json   see lower  Close Visual Studio Delete   vs   bin   obj folders Restart Visual Studio   appsettings json   appsettings development json content                                                 quot Urls quot    quot http   localhost 49438 quot    lt      HERE                                                   quot Logging quot              quot LogLevel quot                quot Default quot    quot Information quot              quot Microsoft quot    quot Warning quot              quot Microsoft Hosting Lifetime quot    quot Information quot                            quot AllowedHosts quot    quot   quot          quot connectionStrings quot

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I had same error showing up  I had my web service set as an application in IIS and I fixed it by   Right-click on my WebService project inside my solution    Properties   Web   Under  Servers  change from IIS Express to Local IIS  it will automatically create a Virtual Directory which is what you want

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FWIW  I tried tons of these options and I didn t get anywhere   Then I realized I had installed VMWare Player just before the issue started   I uninstalled it  and this error went away     I m sure there s some way to make them coexist  but I don t really need Player so I just removed it   If you ve tried all kinds of stuff and it s not working consider looking through any programs you ve installed recently  especially those that deal with network adapters   and see if that gets you anywhere

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You re looking for netstat   Open an administrative command shell and run  netstat -aob  And look for port 10360  It ll show you what executable opened the port and what PID to look up in Task Manager   Actually  run netstat -  in an unprivileged shell first  because I don t approve of blindly running anything you don t understand  especially in a privileged context    Here s what the switches do   -a shows all connections or open ports  not just active ones - the port you want is probably listening  not active   -o shows the owning PID of the connection or port  so you can find the process in Task Manager s Processes tab   You might need to add the PID column in Task Manager  View- Select Columns   -b shows the binary involved in opening the connection or port  This is the one that requires elevated access

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I had the same problem  but no proccess appeared neither in netstat nor in resmon   What solved the problem for me was closing all the open browser windows

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I had a similar issue running Visual Studio 2019 on Windows 10   Some solutions that worked for others seemed to include    Changing the application port number   Have Visual studio automatically assign a port number each time the application start  Restart Visual Studio Restart the computer     Unfortunately  none of these solutions worked for me  assigning another port number did work but was not an acceptable solution as it was important for my application to run on a specified port    The Solution  First I ran the command    netsh http add iplisten ipaddress      from an elevated command-line process  This solved the initial error  when attempting to run the application I no longer got the  port in use  error  instead  I now got an error stating the application was unable to bind to the port because administrative privileges were required   although I was running Visual Studio as administrator   The second error was caused by Hyper-V that adds ports to the Port Exclusion Range  the port my application uses was in one of these exclusion ranges   You can view these ports by running the following command  netsh interface ipv4 show excludedportrange protocol tcp  To solve this second error    Disable Hyper-V  Control Panel-  Programs and Features-  Turn Windows features on or off  Untick Hyper-V Restart the computer   Add the port you are using to the port exclusion range  netsh int ipv4 add excludedportrange protocol tcp startport 50403 numberofports 1 store persistent Reenable Hyper-V Restart the computer   From here everything worked perfectly

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The error message should tell you which application is already using the port - in my case it was explorer exe  so it was just a case of restarting explorer from task manager

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For me netstat did the trick to show me that I had Fiddler running which was keeping the port open

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When Port xxxx is already being used  there s always a PID  Process Id  elaborated with the error  Simply go to the task manager on the machine you are running the application  click on details  and you will identify what the other application is  You can then decide whether you want to end that process or not

User · Answer

Delete the  sln file  if you have one  Open the file C  Users NN Documents IISExpress config applicationhost config Locate the problematic site in configuration system applicationHost sites and delete the whole site section   Open Web Site    from Visual Studio and the project will be given a random new port

[visual-studio-2013] Why and how to fix? IIS Express "The specified port is in use"

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