HTTP Error 503 the service is unavailable

Question

I m really new to setting up web servers in general  I ve got IIS 8 on Windows 8  and I m trying to set up a little site locally  while doing some development  In IIS I choose Add Site  give a name  points to a location where I have a index html file  I ve tried different locations  latest in a c  inetpub wwwroot test -folder  and otherwise use all default settings  However  when I try to browse to localhost I get      HTTP Error 503  The service is unavailable    I ve verified the pool is started  and I ve given IIS IUSRS Full Control on the target folder  I ve search around but not found anything that solved my issue  and there s nothing helpfull in the EventLog or in the C  Windows System32 LogFiles HTTPERR folder  Could anyone tell me what s wrong

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Actually  in my case https   localhost was working  but http   localhost gave a HTTP 503 Internal server error  Changing the Binding of Default Web Site in IIS to use the hostname localhost instead of a blank host name    tname for http binding

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This could also happen if any recent installs or updates happened with  NET framework and or ASP NET  If you are unsure of what happened recently and if all your apps use ASP NET version 4  you can try reset them by running the following commands in command prompt in administrator mode   cd C  Windows Microsoft NET Framework64 v4 0 30319 aspnet regiis -i   This makes sure to install or reinstall ASP NET 4 and updates existing applications to use ASP NET 4 version of the app pool  It updates both IIS Classic and Integrated mode handlers and script mappings in the IIS metabase  It also recreates ASP NET v4 0 and ASP NET v4 0 Classic app pools  and sets  NET framework 4 to DefaultAppPool and Classic  NET app pools

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I had the same issue for the longest time and I thought there was an issue with my code   Turns out  in the IIS server  my application pool for that particular project was stopped   I turned it back on and that fixed the issue   Error 503 is most likely related to the  Application Pool

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If you have McAfee HIPS and if you see the following error in event viewer application log        The Module DLL C  Windows System32 inetsrv HipIISEngineStub dll failed to load        The data is the error      Then this workaround on McAfee com resolved the issue in my case   Quote from the page         Click Start  Run  type explorer and click OK    Navigate to   windir  system32 inetsrv config   Open the file applicationHost config as Administrator for editing in Notepad    Edit the  lt globalModules  section and remove the following line     lt add name  MfeEngine  image   windir  System32 inetsrv HipIISEngineStub dll       Edit the  lt modules  section and remove the following line     lt add name  MfeEngine            After you have finished editing the applicationHost config file  save the file  then restart the IIS server using iisreset or by restarting the system

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Same thing with IIS Express 10 0 after upgrading Windows 7 to Windows 10  Solution  go to IIS and enable all disabled websites and reinstall ASP NET Core

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For me the solution is to change Enable 32-bit Applications to False  None of the answers worked for me  So I d like to share what I found after hours of research   Keep seeing this message from event logs  The Module DLL C  Windows system32 RpcProxy RpcProxy dll failed to load  The data is the error  Turns out that dll is 64bit and cannot be loaded into 32bit process

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I had the same problem and found it was caused by permission problems creating the user profile in C  Users  I gave ApplicationPoolIdentity full permissions to the C  Users folder  started the site and everything worked  the profile must have been created properly  and my site worked as it should  I then removed access to C  Users from ApplicationPoolIdentity   Site wont start on local using ApplicationPoolIdentity  only when using NetworkService   quot HTTP Error 503  The service is unavailable  quot

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In our case  nothing was logged  other than the HTTP error log entry for the 503   but the Enabled Protocols value for the web application in IIS had a typo in it   Instead of http https there was a period in-between the protocols   http https

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In my case Pool uses custom identity account and password  After password expired and reload the error has ocured I simply correct password in identity

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It is possible that your domain requires the account used for running the AppPool to have batch logon rights  In which case you will see this same error message  The way you can tell if that is the case  is by looking at the System events in the Event Viewer  There should be an event saying that the account being used with the App Pool has either  the wrong password or does not have batch logon rights    This is why developers quite often use IIS Express on their development machine  since it by passes the batch logon rights issue

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I ran into the same issue  but it was an issue with the actual site settings in IIS   Select Advanced Settings    for your site application and then look at the Enabled Protocols value  For whatever reson the value was blank for my site and caused the following error      HTTP Error 503  The service is unavailable    The fix was to add in http and select OK  The site was then functional again

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For Windows Server 2012 R2 I did this  IIS    App   Pools     had black    stop    square    right-click it   start

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Our server ran out of disk space on Sunday afternoon which led to an application suddenly failing and returning HTTP error 502  The logs were empty so it had to be something that was occurring before IIS even did anything   A swift look at the event viewer WIN R  gt  eventvwr  exposed the issue     It s a good idea to filter out the output of the System and Application windows to WAS since it can get pretty verbose in there   The application depended on another one which was disabled  Therefore keep in mind an application can go down indirectly if one of it s dependent processes has gone down  We simply re-enabled the  NET application pool and our other application started running normally again

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Start by looking in Event Viewer  either under the System or the Application log   In my case the problem was that no worker process could be started for the App Pool because its configuration file couldn t be read - I had included an extra     at the end of its name

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I resolved this issue by removing a URL reservation that matched my app directory in IIS  I had a similar  definitely not the same  issue as outlined in this article    A Not So Common Root Cause for 503 Service Unavailable

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If you have IIS URL Rewriting installed it could be to do with that   I suffered issues after a Windows 10 Update   This StackOverflow post helped me   Go to Windows Control Panel   Programs and Features   IIS URL Rewrite Module 2   Repair

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If it helps anyone  and this may be laughable  but not obvious to me  was the application pool was not started  I just presumed on starting the website or creating the application pool  it would start  In fact  I didn t even know you had to start the application pool

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In my case  the application pool had stopped  Starting it fixed the problem    My website is hosted on Arvixe  The error problem probably occurred because I have membership based application and something bad happened when I was upload files

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In my case the problem was the DefaultAppPool  I changed the  Load User Profile  to false and now it works  However  I don t know if there are side effects to this

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In IIS  go to the Application Pools under the Server  then find the correct Application Pool for your web site  and click on it  On the Advanced Settings menu to the right  under General  make the  Enable 32-bit Applications    true   This somehow worked for me

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This might be because of number of connections to the database  I had such a situation and so  wrote a de-constructor and killed db open connection and it resolved

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i see this error after install url rewrite module i try to install previous version of it from    https   www microsoft com en-us download details aspx id 7435 it fixed my error

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In my case  the problem was that another application was using the port that I had bound to my web site   I found it by running the following command from a command line  which lists all of the listening ports and the executable involved   netstat -b

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This happened to me on a server on our intranet  After browsing through blog posts and Windows logs  it turned out that a few days before Christmas 2015  related to a Windows Update   my web site application pool wanted to create a config file in folder c  inetpub temp appPools  but access to this folder was restricted  This caused the application pool to be disabled   After adding Full control to Everyone on this temp folder  I restarted the Windows Process Activation Service and everything went online again   If I d been a little more elegant  it would probably had been enough to grant the AppPool user full control to the folder  but I never seem to remember how the app pool name and app pool user relates to eachother

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In my case  the App Pool associated with the domain did not match the App Pool associated with the individual sites applications  I m not sure how this happened but once the domain App Pool was corrected  the issue was resolved

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I had the same issue because of not enough memory on a server machine  Actually there was 1 16 gb of memory available  but IIS automatically started working properly after unload several unused apps  they not owned port 80

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I had the same error today  The issue was that I recently changed the domain password  so I had to update it in each Application Pool  in Advanced Settings   Process Model   Identity credentials

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Also check the address bar and make sure the page is in the right location    This error can be returned instead of the 404  Page not found   In my case  it was a bad link on the page that didn t have a subfolder included

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For my case  My Default Application Pool was offline  to troubleshoot the problem  I checked the IIS logs located in C  Windows System32 LogFile HTTPERR Scroll down to the most recent error logs  this will show you problems with IIS if any My Error was  503 1 AppOffline DefaultPool   Solution Open you IIS Manager   -Click on Application Pools  this lists all application pool to your right  -Check if the application pools hosting your api or site has a stop sign on it  If so  right click the application pool and click start   Trying again to access your service from the client This worked for me  Shouts out to  kombsh

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In my case  I created a new App Pool  and just forgot to start it

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I followed Solve HTTP Error 503 link above  In my case my application pool was stopping every time when I right click on my svc file and choose  Browse     I followed below steps to solve problem of Application Pool stopping  I am using Windows Server 2008 R2   In my IIS manager application pool  I right-clicked on the application pool which I am interested in and clicked Advanced Settings  This opens up Advanced Settings popup   In that under Process Model section click Identity and clicked Set button in my Application Pool Identity popup  This will open Set credentials popup where I gave Username  password  and confirm password and clicked OK    Now when I right click on my svc file it opens up in IE browser

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I was having this problem when cleaning up my IIS on dev machine  and I had somehow created a virtual folder for a subfolder of my actual development web that I couldn t clear and was creating conflicts   To clear it I had to use   C  Windows System32 inetsrv appcmd exe list vdir   and then individually remove the problem virtual directories using  C  Windows System32 inetsrv appcmd exe delete app  app name  Default Web Site   name of virtual directory

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It could be that the user identity is outdated  especially if you ve tried starting a stopped app pool and the next request again fails   In IIS  go to the Application Pools under the Server  then find the correct Application Pool for your web site  and click on it  On the Advanced Settings menu to the right   select Identity and change it and enter new user and password  Click on your Application Pool again  and select Recycle to restart it   You can also try looking at the error message in Event Viewer  under Windows Logs  Application  Details tab

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Other answers are fine  But in my case  I was working on a Windows box that already was running some old IIS  IISExpress or any other web site  What happened is urls ACLs where reserved somehow in the system  So  you might want to check this   Here is the console command to dump all URL acls   netsh http show urlacl   Check what s returned here  and if anything matches the url you are testing  here is the command to delete one URL acl  for example    netsh http delete urlacl url http   localhost 2018     beware to carefully note what you do here in case it was not related to the original problem

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For me  the DefaultAppPool was unable to start and the event log told me that C  Windows System32 inetsrv redirect dll was unable to load   The file was missing  The cause for this was that the Windows feature  HTTP Redirection  was not installed  Check if that feature is ticket under Internet Information Services World Wide Web Services Common HTTP Features HTTP Redirection  No reboot should be required if you just installed it now

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Check Event Viewer - Windows - Application  If there is a red Error line made from IIS-W3SVC-WP and the message is like The Module DLL C  Windows system32 inetsrv rewrite dll failed to load  The data is the error  then you are missing some Windows Setup features   In Windows Server 2012 go to Server Manager  Add Roles and Features  Web Server  IIS  and add the matching feature  Usually  most of the Application Development section is installed  Here is a complete list of IIS features and their associated DLL to help in diagnosis   After going through a few iterations of that I ended on the error message above regarding  rewrite dll   This led to a direct download and install of Microsoft URL Rewrite tool  Finally all websites came to life

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If the app pool immediately stops after you start it and your event log shows      The worker process for application pool  APP POOL NAME  encountered an   error  Cannot read configuration file   trying to read configuration   data from file        line number  0   The data field contains   the error code        you may experiencing a bug that was apparently introduced in the Windows 10 Fall Creators Update and or  Net Framework v4 7 1  It can be resolved via the following workaround steps  which are from this answer to the related question Cannot read configuration file   39  trying to read configuration data from file   39      lt EMPTY gt   39   line number   39 0  39          Go to the drive your IIS is installed on  eg  C  inetpub temp appPools    Delete the directory  or virtual directory  with the same name as your app pool    Recycle Start your app pool again       I have reported this bug to Microsoft by creating the following issue on the dotnet GitHub repo  After installing 4 7 1  IIS AppPool stops with  Cannot read configuration file    EDIT  Microsoft responded that this is a known issue with the Windows setup process for the Fall Creators Update and was documented in KB 4050891  Web applications return HTTP Error 503 and WAS event 5189 on Windows 10 Version 1709  Fall Creators Update   That article provides the following workaround procedure  which is similar to the one above  However  note that it will recycle all app pools regardless of whether they are affected by the issue         Open a Windows PowerShell window by using the Run as administrator   option    Run the following commands          Stop-Service -Force WAS   Remove-Item -Recurse -Force C  inetpub temp appPools     Start-Service W3SVC

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If App pool is running under some user identity then go to the advance settings of update username password again  it worked for me

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You can also try the following  Right-click on the site and  Basic Settings     Click on  Connect As     Click on Specific User and give the new credentials  Now it should work

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After some try and error I found out  that the app pool was configured to use my domain account as identity and I remembered that I changed the password of my domain account shorty before  Resetting the application pool   s identity  using my new password  fixed the problem and the app pool could be restarted without any problems

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I changed the port from 80 to 8080  that s why this error occur  I write localhost  in search bar then this error occur  My problem is resolved by writing localhost 8080  in the search then local host open

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Check your application s respective Application Framework Pool - it could be stopped  If it is  start it and check again   If you re still experiencing issues you can also check out Event Viewer to find the cause of that error in order to troubleshoot more

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I got this error when I installed Skype  Because my site uses port 80 and Skype uses the same port also   Please see this

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I got this error with a  Net MVC application that uses Kentico as a satellite CMS  The issue was that it needed a proper license for the URL my app was on  It basically stopped the app and caused IIS to return nothing but this 503 - service not available message  I ended up finding the error details in Kentico s Event Log  as a warning   You can create a new license or find license details in Kentico s client portal - https   client kentico com

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I know this is answered in different way but in my case  I noticed the app pool stopping automatically even after a manual restart  And it but when I change the password for the account used and is changed few days ago  it works just fine without any other change  Try the same

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Or if none of the current solutions work  look in your website s directory for a file called app offline htm  That basically tells IIS that your site is unavailable and to show this page instead    To fix it  either delete it or rename it to app offline htm bak   In my case  I added it while showing a colleague how to use that to prevent traffic to the site temporarily and then forgot that I did that on my box  Sigh

[asp.net] HTTP Error 503, the service is unavailable

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