The remote server returned an error 403 Forbidden

Question

I ve written an app that has worked fine for months  in the last few days I ve been getting the error below on the installed version only   If I run the source code in VS everything works fine  Also  the  exe in the bin folders work fine  It s only the installed version which generates the error  if I recompile and reinstall I get the same error   I m a bit stumped as to what s causing this and hoped for a few pointers  It seems to be a WebRequest response through IE is not being returned but I m stumped as to why it works fine in VS without any errors  Are there any new IE security measures polices that may cause this   Things I ve tried so far include    Disabled all AntiVirus  amp  Firewall  Run as Administrator   The Exception   Exception  System Windows Markup XamlParseException  The invocation of the constructor on type  XApp MainWindow  that matches the specified binding constraints threw an exception  --- gt  System Net WebException  The remote server returned an error   403  Forbidden     at System Net HttpWebRequest GetResponse      at XApp HtmlRequest getHtml Uri uri  in J  Path MainWindow xaml cs line 3759    at XApp MainWindow GetLinks   in J  Path MainWindow xaml cs line 2454    at XApp MainWindow  ctor   in J  Path MainWindow xaml cs line 124    --- End of inner exception stack trace ---    at System Windows Markup WpfXamlLoader Load XamlReader xamlReader  IXamlObjectWriterFactory writerFactory  Boolean skipJournaledProperties  Object rootObject  XamlObjectWriterSettings settings  Uri baseUri     at System Windows Markup WpfXamlLoader LoadBaml XamlReader xamlReader  Boolean skipJournaledProperties  Object rootObject  XamlAccessLevel accessLevel  Uri baseUri     at System Windows Markup XamlReader LoadBaml Stream stream  ParserContext parserContext  Object parent  Boolean closeStream     at System Windows Application LoadBamlStreamWithSyncInfo Stream stream  ParserContext pc     at System Windows Application LoadComponent Uri resourceLocator  Boolean bSkipJournaledProperties     at System Windows Application DoStartup      at System Windows Application  lt  ctor gt b  1 Object unused     at System Windows Threading ExceptionWrapper InternalRealCall Delegate callback  Object args  Int32 numArgs     at MS Internal Threading ExceptionFilterHelper TryCatchWhen Object source  Delegate method  Object args  Int32 numArgs  Delegate catchHandler  Exception  System Net WebException  The remote server returned an error   403  Forbidden     at System Net HttpWebRequest GetResponse      at XApp HtmlRequest getHtml Uri uri  in J  Path MainWindow xaml cs line 3759    at XApp MainWindow GetLinks   in J  Path MainWindow xaml cs line 2454    at XApp MainWindow  ctor   in J  Path MainWindow xaml cs line 124   EDIT   This is installed as a standalone app  When I ve run as Administrator  I ve opened the program folder and run the exe as administrator rather than the shortcut   The code that causes the issue is this  private void GetLinks           Navigate to front page to Set cookies     HtmlRequest htmlReq   new HtmlRequest         OLinks   new Dictionary lt string  List lt string gt  gt          string Url    http   www somesite com somepage       CookieContainer cookieJar   new CookieContainer        HttpWebRequest request    HttpWebRequest WebRequest Create Url       request CookieContainer   cookieJar       request Accept     text html  application xhtml xml            request Referer     http   www somesite com        request Headers Add  Accept-Language    en-GB        request UserAgent     Mozilla 5 0  compatible  MSIE 10 0  Windows NT 6 2  Trident 6 0        request Host     www somesite com        HttpWebResponse response    HttpWebResponse request GetResponse        String htmlString      using  var reader   new StreamReader response GetResponseStream                   htmlString   reader ReadToEnd                 More Code

User · Answer

In my case I remembered that a hole in the firewall was created for this address some time ago  so I had to set useDefaultWebProxy  false  on the binding in the config file  as if the default was to use the proxy if useDefaultWebProxy is not specified

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private class GoogleShortenedURLResponse               public string id   get  set            public string kind   get  set            public string longUrl   get  set               private class GoogleShortenedURLRequest               public string longUrl   get  set               public ActionResult Index1                 return View                AcceptVerbs HttpVerbs Post       public ActionResult ShortenURL string longurl                string googReturnedJson   string Empty          JavaScriptSerializer javascriptSerializer   new JavaScriptSerializer             GoogleShortenedURLRequest googSentJson   new GoogleShortenedURLRequest            googSentJson longUrl   longurl          string jsonData   javascriptSerializer Serialize googSentJson            byte   bytebuffer   Encoding UTF8 GetBytes jsonData            WebRequest webreq   WebRequest Create  https   www googleapis com urlshortener v1 url            webreq Method   WebRequestMethods Http Post          webreq ContentLength   bytebuffer Length          webreq ContentType    application json            using  Stream stream   webreq GetRequestStream                          stream Write bytebuffer  0  bytebuffer Length               stream Close                       using  HttpWebResponse webresp    HttpWebResponse webreq GetResponse                          using  Stream dataStream   webresp GetResponseStream                                  using  StreamReader reader   new StreamReader dataStream                                         googReturnedJson   reader ReadToEnd                                                         GoogleShortenedURLResponse googUrl   javascriptSerializer Deserialize lt googleshortenedurlresponse gt  googReturnedJson              ViewBag ShortenedUrl   googUrl id          return View

User · Answer

Add the following line   request UseDefaultCredentials   true    This will let the application use the credentials of the logged in user to access the site  If it s returning 403  clearly it s expecting authentication   It s also possible that you  now   have an authenticating proxy in between you and the remote site  In which case  try   request Proxy Credentials   System Net CredentialCache DefaultCredentials    Hope this helps

User · Answer

Setting   request Referer     http   www somesite com      and adding cookies than worked for me

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This probably won t help too many people  but this was my case  I was using the Jira Rest Api and was using my personal credentials  the ones I use to log into Jira   I had updated my Jira password but forgot to update them in my code  I got the 403 error  I tried updating my password in the code but still got the error    The solution  I tried logging into Jira  from their login page  and I had to enter the text to prove I wasn t a bot  After that I tried again from the code and it worked  Takeaway  The server may have locked you out

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Looks like problem is based on a server side   Im my case I worked with paypal server and neither of suggested answers helped  but http   forums iis net t 1217360 aspx HTTP 403 Forbidden error     I was facing this issue and just got the reply from Paypal technical    Add this will fix the 403 issue    HttpWebRequest req    HttpWebRequest WebRequest Create url     req UserAgent     any words that is more than 5 characters

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In my case I had to add both  user agent  and  default credentials   True   I know this is pretty old  still wanted to share  Hope this helps  Below code is in powershell  but it should help others who are using c    System Net HttpWebRequest   req    System Net HttpWebRequest   Create  uri   req UserAgent    quot BlackHole quot   req UseDefaultCredentials    true

User · Answer

Its a permissions error  Your VS probably runs using an elevated account or different user account than the user using the installed version   It may be useful to check your IIS permissions and see what accounts have access to the resource you are accessing   Cross reference that with the account you use and the account the installed versions are using

User · Answer

In my case  I had to call an API repeatedly in a loop  which resulted in halt of my system returning a 403 Forbidden Error  Since my API provider does not allow multiple requests from the same client within milliseconds  I had to use a delay of 1 second at least    foreach  var it in list        Thread Sleep 1000          Call API

User · Answer

We should access the website using the name given in the certificate

[c#] The remote server returned an error: (403) Forbidden

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