Sys WebForms PageRequestManagerServerErrorException An unknown error occurred while processing the request on the server

Question

I have couple of update panels and jquery tabs on page  And also I am loading couple user controls on update panels  After user waited for couple of minutes  not checked the time approx 40 mins   when user send request from submit button it is giving below error     Sys WebForms PageRequestManagerServerErrorException  Sys WebForms PageRequestManagerServerErrorException  An unknown  error occurred while processing the request on the server  The status  code returned from the server was  0  when calling method    nsIDOMEventListener  handleEvent    I am not able trace this issue to fix  But I am sure  This is causing by Ajax  Gurus  if you knows solution  Please let me know

User · Answer

I have got the same issue  here I give my problem and my solution hoping this would help someone   Following other people recommendation I went to the log of the server  Windows Server 2012 in my case  in    Control Panel -  Administrative Tools -  Event Viewer  Then in the left side   Windows Logs -  Application     In the warnings I found the message from my site and in my case it was due to a null reference    Exception type  NullReferenceException  Exception message  Object reference not set to an instance of an object     And checking at the function described in the log I found a non initialized object and that was it   So it could be a null reference exception in the code  Hope someone find this useful  greetings

User · Answer

I had the same issue  when i was trying out a way to solve it  i found out that the update panel was causing  this issue  Depending on my requirement i could remove the update panel and get rid of the issue   So it s a possible solution for the issue

User · Answer

I had this issue when I upgraded my project to 4 5 framework and the GridView had Empty Data Template  Something changed and the following statement which previously was returning the Empty Data Template was now returning the Header Row   GridViewRow dr    GridViewRow this grdViewRoleMembership Controls 0  Controls 0     I changed it to below and the error went away and the GridView started working as expected   GridViewRow dr    GridViewRow this grdViewRoleMembership Controls 0  Controls 1     I hope this helps someone

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This issue sometimes occurs when you have a control registered as an AsyncPostbackTrigger in multiple update panels  If that s not the problem  try adding the following right after the script manager declaration  which I found in this post by manowar83  which copies and slightly modifies this post by larryw    lt script type  quot text javascript quot  language  quot javascript quot  gt      Sys WebForms PageRequestManager getInstance   add endRequest EndRequestHandler       function EndRequestHandler sender  args           if  args get error      undefined               args set errorHandled true                    lt  script gt    There are a few more solutions discussed here  http   forums asp net t 1066976 aspx 9 10

User · Answer

Use the following code below inside updatepanel    lt script type  text javascript  language  javascript  gt      Sys WebForms PageRequestManager getInstance   add endRequest EndRequestHandler       function EndRequestHandler sender  args           if  args get error      undefined               args set errorHandled true                    lt  script gt

User · Answer

JS5   I also faced the same issue as you  ImageButton causing exceptions inside UpdatePanel only on production server and IE  After some research I found this      There is an issue with ImageButtons and UpdatePanels   The update to    NET 4 5 is fixed there   It has something to do with Microsoft   changed the x y axis of a button click from Int to Double so you can   tell where on the button you clicked and it s throwing a conversion   error    Source  I m using NetFramework 2 0 and IIS 6  so  the suggested solution was to downgrade IE compatibility adding a meta tag    lt meta http-equiv  X-UA-Compatible  content  IE 9    gt    I ve done this via Page Load method only on the page I needed to   Sub Page Load ByVal sender As Object  ByVal e As EventArgs      Dim tag As HtmlMeta   New HtmlMeta        tag HttpEquiv    X-UA-Compatible      tag Content    IE 9       Header Controls Add tag  End Sub   Hope this helps someone

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Had this problem when using AsyncFileUploader in an iFrame   Error came when using firefox   Worked in chrome just fine   It seemed like either the parent page or iframe page was loading out of sync and the parent page could not find the controls on the iframe page   Added a simple javascript alert to say that the file was uploaded   This gave the controls enough time to load and since the controls were available  everything loaded without an error

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My fix for this was to remove any HTML markup that was in the Text    property of a TextBox in my asp net code  inside an update panel  If you have more than one update panel on a page  it will affect them all  which makes it harder to work out which panel has the issue  Chris s answer above lead me to find this  but his is a very hidden answer but I think a very relevant one so here is an answer explained    lt asp TextBox ID  bookingTBox  runat  server  ToolTip    Width  150px  Text   lt Auto Assigned gt   CssClass  textboxItalicFormat  gt  lt  asp TextBox gt    The above code will give this error   The below will not    lt asp TextBox ID  bookingTBox  runat  server  ToolTip    Width  150px  Text  Auto Assigned  CssClass  textboxItalicFormat  gt  lt  asp TextBox gt    In the second textbox code I have removed the  lt  and   from the Text    property  Please try this before spending time adding lines of script code  etc

User · Answer

This issue for me was caused by a database mapping error   I attempted to use a select   call on a datasource with errors in the code behind   My controls were within an update panel and the actual cause was hidden   Usually  if you can temporarily remove the update panel  asp net will return a more useful error message

User · Answer

I got this error when I had ModalPopupExtender in the update panel    deubbing my code I found that the above error is caused because of updatepanel updatemode is conditional    so i change it to always then problem is solved

User · Answer

Brother  this piece of code is not a solution just change it to   lt script type  text javascript  language  javascript  gt      Sys WebForms PageRequestManager getInstance   add endRequest EndRequestHandler       function EndRequestHandler sender  args           if  args get error      undefined                 alert args get error   message substr args get error   name length   2                  args set errorHandled true                    lt  script gt    and you will see the error is there but you are just not throwing it on UI

User · Answer

as my friend  RaviKumar mentioned above one reason of following problem is that some piece of data transferred from code to UI contain raw html tags which make request invalid for example I had a textarea and in my code I had set its value by code below   txtAgreement Text   Data Agreement  And when I compiled the page I could see raw html tag inside textarea so I changed textarea to div on which innerhtml works and render html  instead of injecting raw html tags into element  and it worked for me  happy coding

User · Answer

I got this error when I had my button in the GridView in an UpdatePanel    deubbing my code I found that the above error is caused because of another internal error  A potentially dangerous Request Form value was detected from the client    Finally I figured out that one of my TextBoxes on the page has XML HTML content and this in-turn causing above error when I removed the xml HTML and tested the button click     it worked as expected

User · Answer

This is not the real problem  if you want to see why this is happening then please go to error log file of IIS   in case of visual studio kindly navigate to   C  Users User Documents IISExpress TraceLogFiles  your project name     arrange file here in datewise descending and then open very first file   it will look like     now scroll down to bottom to see the GENERAL RESPONSE ENTITY BUFFER it is the actual problem  now solve it the above problem will solve automatically

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answer for me was to fix a gridview control which contained a template field that had a dropdownlist which was loaded with a monstrous amount of selectable items- i replaced the DDL with a label field whose data is generated from a function   i was originally going to allow gridview editing  but have switched to allowing edits on a separate panel displaying the DDL for that field for just that record    hope this might help someone

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I also faced the same issue   and none of these worked  In my case this was fixed by adding these lines in config file    lt appSettings gt     lt add key  aspnet MaxHttpCollectionKeys  value  100000    gt   lt  appSettings gt    lt system web extensions gt     lt scripting gt          lt scriptResourceHandler enableCompression  false  enableCaching  true   gt            lt  scripting gt   lt  system web extensions gt

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Be sure to put tilde and forward slash     when CDN is the root directory  I think it s an issue in IIS

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We also faced the same issue  and the problem could only be reproduced in the server  i e   not locally  which made it even harder to fix  because we could not debug the application   and when using IE  We had a page with an update panel  and within this update panel a modalpopupextender  which also contained an update panel  After trying several solutions that did not work  we fix it by replacing every imagebutton within the modalpopupextender with a linkbutton  and within it the image needed

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This solution is helpful too   Add validateRequest  false  in the  lt    Page directive    This is because ASP net examines input from the browser for dangerous values  More info in this link

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Some times due to some code you get HTML tags in a text filed  like I was replacing some characters with new line BR tag of HTML and by mistake I also replaced it in the text that was supposed to be displayed in a Multiline text box so my multiline text box had a new line HTML tag BR in it coming dynamically due to my string replace function and I started getting this JavaScript error and as this HTML code was displayed in a text box that was in an update panel I start getting this error so I made the correction and all was fine  So before copying pasting anything please look at your code and see that all tag are closed proper and no irrelevant code data is coming to text boxes or Drop down lists  This error always come due to ill formed tags and irrelevant data

User · Answer

lt add key  aspnet MaxHttpCollectionKeys  value  100000    gt    Add above key to Web config or App config to remove this error

User · Answer

This was working fine in my code   i solved my issue   really  Add below code in web config file    lt system web gt       lt httpRuntime executionTimeout  999  maxRequestLength  2097151   gt   lt  system web gt

User · Answer

I had this issue and I spent hours trying to fix it   The solution ticked as answered will not fix the error only handle it   The best approach is to check the IIS log files and the error should be there  It appears that the update panel encapsulates the real error and outputs it as a  javascript error    For instance my error was that I forgot to make a class  Serializable   Although this worked fine locally it did not work when deployed on the server

User · Answer

1- Go to the web config of your application      2- Add a new entry under  lt  system web          3- Also Find the pages tag and set validateRequest False  Only this works for me

User · Answer

For those using the internal IIS of Visual Studio  try the following    Generate the error message  Break the debugger at the error display  Check the callstack   You should see  raise   Double click  raise   Check the internals of  sender  parameter   You will see a   xmlHttpRequest  property  Open the   xmlHttpRequest  property  and you ll see a  response  property  The  response  property will have the actual message    I hope this helps someone out there

User · Answer

For me the problem was that I was using a  lt button gt  instead of a  lt asp LinkButton gt

User · Answer

Check your Application Event Log - my issue was Telerik RadCompression HTTP Module which I disabled in the Web config

[c#] Sys.WebForms.PageRequestManagerServerErrorException: An unknown error occurred while processing the request on the server."

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