ASP NET Core 1 0 on IIS error 502 5

Question

I just updated my server  Windows 2012R2  to  Net Core 1 0 RTM Windows Hosting pack from the previous  Net Core 1 0 RC2  My app works on my PC without any issues but the server keeps showing   HTTP Error 502 5 - Process Failure   Common causes of this issue   The application process failed to start The application process started but then stopped The application process started but failed to listen on the configured port   It previously worked with the RC2 version  Don t know what could go wrong   This is all event viewer says   Failed to start process with the commandline  dotnet   MyWebApp dll   Error code    0x80004005     the worst part is that app logs are empty  I mean those stdout xxxxxxxxx log files are completely empty and all have 0 byte size   What should I do   How can I know the cause of error when it s not logged

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In my case  after installing AspNetCore 2 0 6 RuntimePackageStore x64 exe and DotNetCore 2 0 6-WindowsHosting exe   I need to restart server to make it worked without 502 bad gateway and proxy error   UPDATE   There is a way you could use it without restart  https   stackoverflow com a 50808634 3634867

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I was getting the same error  and found out the problem was that during the publish to Azure  my web config file was modified so this following line ended up like this    lt aspNetCore processPath  bin IISSupport VSIISExeLauncher exe  arguments  -argFile IISExeLauncherArgs txt  forwardWindowsAuthToken  false  stdoutLogEnabled  false  startupTimeLimit  3600  requestTimeout  23 00 00    gt    The problem for Production are the contents of the arguments   -argFile IISExeLauncherArgs txt   It seems like this issue is going to be addressed in the next  NET Core SDK  currently in preview   but for now  the workaround is to add this block to the  csproj file    lt Target Name  bug 242 workaround  AfterTargets   TransformWebConfig  gt       lt Exec Command  powershell  amp quot  Get-Content    PublishDir Web config   replace   -argFile IISExeLauncherArgs txt         Set-Content    PublishDir Web config  amp quot     gt     lt  Target gt    This will modify the web config and remove the problematic part for publishing   Reference  https   github com aspnet websdk issues 242  Hope it helps

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I got this working with a hard reset of IIS  I had only just installed the hosting package    Turns out that just pressing  Restart  in IIS Manager isn t enough  I just had to open a command prompt and type  iisreset

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Sharing that in my case this error was because i forgot to update project json with    buildOptions          emitEntryPoint   true

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I changed profile options to this and it s working         Maybe you should change this two options      Deployment Mode   Target Runtime

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I had the same problem when I updated my dev machine to Core 1 0 1  but forgot to update the server

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For me it was caused by having different versions of  Net Core installed  I matched my dev and production server and it worked

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I faced the same issue when I tried to publish Debug version of my web application  This set of files didn t contain the file web config with the proper value of attribute processPath    I took this file from Release version  value was assigned to the path to my exe file    lt aspNetCore processPath    My Web App exe        gt

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Here is what I figured  and this happened recently on Windows 10 after an update was installed  From what I gathered  a Windows Defender update was installed which assumed my  Project dll  an asp net core project  behaved like a virus so it was deleted    So  one of the first things I suggest you do before you start installing uninstalling stuffs is to check to confirm your  Project dll  is where it should be   Copy it back to the location if it is no longer there   If you are having difficulty copying the file back add an exclusion to your project folder in windows defender    Learn how to do that here     This worked for me instantly  and I repeated it across application multiple servers

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I had a same issue   I changed application pool identity to network service account   Then I explicitly set the path to dotnet exe in the web config for the application to work properly as  danielyewright said in his github comment   It works after set the path   Thanks

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So I got a new server  this time it s Windows 2008R2 and my app works fine   I can t say for sure what the problem was with the old server but I have one idea   So because I previously compiled the app without any platform in mind it gave me the dll version which only works if the target host has  Net Core Windows Hosting package installed  In my case it was installed and that was fine   After the app didn t work I decieded to compile it as a console app with win7-x64 as runtime  This time the moment I ran the exe of my app on the server  it crashed with an error about a missing dll   The program can t start because api-ms-win-crt-runtime-l1-1-0 dll is missing   That dll is from Universal C Runtime that s included in the Visual C   Redistributable for Visual Studio 2015   I tried to install that package  both x64  amp  x86  but it failed each time  don t know why  on Windows Server 2012 R2   But when I tried to install them in the new server  Windows Server 2008 R2  they successfully installed  That might have been the reason behind it  but still can t say for sure

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I had the same issue when publishing the web app  If anybody still has this problem fixed it by changing  AppName  runtimeconfig json           runtimeOptions          framework            name    Microsoft NETCore App          version    1 1 2              configProperties            System GC Server   true               Change the version from  version    1 1 2  to  version    1 1 1  and everythign worked ok

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I had a similar issue  and to quote Sherlock Holmes   when you have eliminated the impossible  whatever remains  however improbable  must be the truth    I checked if the  NET framework I was targeting was installed on the server  and it turns out it wasn t  I installed the 4 6 2  NET Framework and it worked

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I had this problem aswell  The error occurred both on VS 15 and 17   However on VS15 it returned a CONNECTION REFUSED error and on VS17 it returned ASP NET Core 1 0 on IIS error 502 5   FIX   Navigate to your project directory and locate the hidden folder  vs  it s located in the projects folder dir    Remember to show hidden files folders  Close VS Delete  vs-folder Start VS as admin   vs-folder will be recreated by VS

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For me it was that the connectionString in Startup cs was null in   services AddDbContext lt ApplicationDbContext gt  options   gt  options UseSqlServer Configuration GetConnectionString  DefaultConnection        and it was null because the application was not looking into appsettings json for the connection string    Had to change Program cs to   public static void Main string   args        BuildWebHost args  Run       public static IWebHost BuildWebHost string   args    gt       WebHost CreateDefaultBuilder args        ConfigureAppConfiguration  context  builder    gt  builder SetBasePath context HostingEnvironment ContentRootPath        AddJsonFile  appsettings json   Build          UseStartup lt Startup gt    Build

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I had the same problem   To find out the exact source of it I switched on logging in web config file    lt aspNetCore processPath  dotnet  arguments    MyWebService dll  stdoutLogEnabled    true    stdoutLogFile    logs stdout    gt    and created logs subfolder in MyWebService root folder   After restarting IIS and trying to execute API I got an error and it was missing of proper Core Runtime  After downloading an installing DotNetCore 1 0 5 1 1 2-WindowsHosting the error gone

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Had the same issue and all solutions didn t work   Found this gem and thought I d pass along if it helps someone else   Install on Server 2012 R2 getting the DLL missing error  try to reinstall VS C   2015 and get an error   Fix is to do the following   Seems the file  C  ProgramData Package Cache     packages Patch x64 Windows8 1-KB2999226-x64 msu has problems being installed   Open admin command prompt do   c  mkdir tmp mkdir tmp tmp move  C  ProgramData Package Cache     packages Patch x64 Windows8 1-KB2999226-x64 msu  c  tmp expand -F   c  tmp Windows8 1-KB2999226-x64 msu c  tmp tmp dism  online  add-package  packagepath c  tmp tmp Windows8 1-KB2999226-x64 cab   NOTE  replace the       with the correct folder name   After this reinstall the VS C   2015 package

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I solved it by adding  edit permission  to the application of the site  mapped to the physical directory and then selected the windows user that could have access to this root folder   private network

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I got the same problem and the reason in my case was that the EF core was trying to read connection string from appsettings development json file  I opened it and found the connection string was commented            ConnectionStrings            DefaultConnection    Server vaio Database Goldentaurus Trusted Connection True           IdentityConnection    Server vaio Database GTIdentity Trusted Connection True               I then uncommitted them like below and the problem solved        ConnectionStrings          DefaultConnection    Server vaio Database Goldentaurus Trusted Connection True         IdentityConnection    Server vaio Database GTIdentity Trusted Connection True

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I was getting HTTP Error 502 5 while trying to publish my  NET Core 2 0 API to AWS EB  and solved it by adding the following code to the  csproj      lt PropertyGroup gt       lt PublishWithAspNetCoreTargetManifest gt false lt  PublishWithAspNetCoreTargetManifest gt     lt  PropertyGroup gt

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In my case was problem with Net Core version installed on server  I just install the same version as on my development machine and everything is OK  -

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I have no idea why this worked for me  but I am using Windows Authentication and I had this bit of code on my BuildWebHost in Program cs    UseStartup lt Startup gt     UseHttpSys options   gt        options Authentication Schemes           AuthenticationSchemes NTLM   AuthenticationSchemes Negotiate      options Authentication AllowAnonymous   false      Build      After removing the  UserHttpSys bit  it now works  and I can still authenticate as a domain user   BuildWebHost now looks like  public static IWebHost BuildWebHost string   args    gt      WebHost CreateDefaultBuilder args       UseStartup lt Startup gt         Build

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I needed to install the latest  net Core version found here  No need to restart the site or server

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I had a similar issue  Asp Net Core 2 x  that was caused by trying to run a 32-bit asp net core app in IIS on a 64-bit windows server  The root cause was that the web config that is auto-generated  if your project does not explicitly include one  which asp net core projects do not by default  does not contain the full path to the dotnet executable  When you install the hosting bundle on a 64 bit machine it will install the 64 and 32 bit versions of dotnet  but the path will resolve by default to 64 bit and your 32 bit asp net core app will fail to load  In your browser you may see a 502 5 error and if you look the server event log you might see error code 0x80004005  If you try to run dotnet exe from a command prompt to load your asp net core application dll on that server you may see an error like  BadImageFormatException  or  attempt was made to load a program with an incorrect format   The fix that worked for me was to add a web config to my project  and deployment  and in that web config set the full path to the 32-bit version of dotnet exe    lt  xml version  1 0  encoding  utf-8   gt   lt configuration gt       lt location path     inheritInChildApplications  false  gt           lt system webServer gt               lt handlers gt                   lt add name  aspNetCore  path     verb     modules  AspNetCoreModule  resourceType  Unspecified    gt               lt  handlers gt               lt aspNetCore processPath  C  Program Files  x86  dotnet dotnet exe  arguments    My32BitAspNetCoreApp dll  stdoutLogEnabled  false  stdoutLogFile    logs stdout    gt          lt  system webServer gt      lt  location gt   lt  configuration gt

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I was able to fix it by running      C  Program Files dotnet dotnet exe   C  fullpath PROJECT dll    on the command prompt  which gave me a much more meaningful error        The specified framework  Microsoft NETCore App   version  1 0 1  was   not found      - Check application dependencies and target a framework version installed at          C  Program Files dotnet shared Microsoft NETCore App     - The following versions are installed          1 0 0     - Alternatively  install the framework version  1 0 1     As you can see  I had the wrong NET Core version installed on my server  I was able to run my application after uninstalling the previous version 1 0 0 and installing the correct version 1 0 1

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I had the same problem  in my case it was insufficient permission of the user identity of my Application Pool  on Publishing to IIS page of asp net doc  there is a couple of reason listed for this error    If you published a self-contained application  confirm that you didn   t set a platform in buildOptions of project json that conflicts with the publishing RID  For example  do not specify a platform of x86 and publish with an RID of win81-x64  dotnet publish -c Release -r win81-x64   The project will publish without warning or error but fail with the above logged exceptions on the server  Check the processPath attribute on the  lt aspNetCore gt  element in web config to confirm that it is dotnet for a portable application or   my application exe for a self-contained application  For a portable application  dotnet exe might not be accessible via the PATH settings  Confirm that C  Program Files dotnet  exists in the System PATH settings  For a portable application  dotnet exe might not be accessible for the user identity of the Application Pool  Confirm that the AppPool user identity has access to the C  Program Files dotnet directory  Confirm that you have correctly referenced the IIS Integration middleware by calling the  UseIISIntegration   method of the application   s WebHostBuilder    If you are using the  UseUrls   extension method when self-hosting with Kestrel  confirm that it is positioned before the  UseIISIntegration   extension method on WebHostBuilder     UseIISIntegration   must set the Url for the reverse-proxy when running Kestrel behind IIS and not have its value overridden by  UseUrls      In my case it was the fourth reason  I changed it by right clicking my app pool  and in advanced setting under Process Model  I set the Identity to a user with enough permission

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Open command prompt with Administrator credentials  Type following command and hit enter      gt   IISRESET   OR  Open Visual Studio 2017 with Administrator credentials  Type following command in Package Manager Console and hit enter     PM gt   IISRESET   PM gt  IISRESET Attempting stop    Internet services successfully stopped Attempting start    Internet services successfully restarted

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I got this issue on my production server after my VS project was automatically upgraded to  NET Core 1 1 2   I simply installed the 1 1 2  net core runtime from here on my production server  https   www microsoft com net download core  runtime

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I had the same error in question  with the same issues as described by VSG24 in Proposed answer - nasty error message when typing  dotnet  into CMD       The program can t start because api-ms-win-crt-runtime-l1-1-0 dll is missing   I solved this by manually installing the following 2 updates on Windows Server 2012 R2  and the pre-requisites and all the other updates linked - read the installation instructions carefully on the Microsoft website          KB2919355   KB2999226      Hope this helps someone

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Worked for me after changing the publishing configuration

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SOLVED I just ran through the same issue today while deploying to AZURE  Then I tried the same for local IIS  got the same issue  As I am new to  net CORE  struggled few hour before I actually solved it   In our solution  after I publish to IIS  I observed my web confile file  specially below line  lt aspNetCore processPath  bin IISSupport VSIISExeLauncher exe  arguments  -argFile IISExeLauncherArgs txt  forwardWindowsAuthToken  false  stdoutLogEnabled  false    gt   In our deployment folder the generated web config looks like  lt aspNetCore processPath  dotnet  arguments    Yodlee dll -argFile IISExeLauncherArgs txt  forwardWindowsAuthToken  false  stdoutLogEnabled  false  stdoutLogFile    logs stdout    gt   Now PLEASE try changing the above configuration in visual studio solution to lt aspNetCore processPath  bin IISSupport VSIISExeLauncher exe  forwardWindowsAuthToken  false  stdoutLogEnabled  false    gt   In our new deployment folder the generated web config looks like  lt aspNetCore processPath  dotnet  arguments    Yodlee dll  forwardWindowsAuthToken  false  stdoutLogEnabled  false  stdoutLogFile    logs stdout    gt   And This SOLVED my problem  Hope it help

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