IIS 7.5 , 2008rc2, classic asp, 500 error msg:
The page cannot be displayed because an internal server error has occurred.
I need to know how to configure IIS to get a more detailed error.
I've tried setting to true all of debugging options in the ASP configuration.
But that didn't work. Can anyone help me?
I have come to the same problem and fixed the same way as Alex K.
So if "Send Errors To Browser" is not working set also this:
Error Pages -> 500 -> Edit Feature Settings -> "Detailed Errors"
Also note that if the content of the error page sent back is quite short and you're using IE, IE will happily ignore the useful content sent back by the server and show you its own generic error page instead. You can turn this off in IE's options, or use a different browser.
If you're on a remote server you can configure your web.config file like so:
<configuration>
<system.webServer>
<httpErrors errorMode="Detailed" />
<asp scriptErrorSentToBrowser="true"/>
</system.webServer>
<system.web>
<customErrors mode="Off"/>
<compilation debug="true"/>
</system.web>
Double click "ASP" in the site's Home screen in IIS admin, expand "Debugging Properties", enable "Send errors to browser", and click "Apply".
Under "Error Pages" on the home screen select "500", then "Edit feature settings" and select "Detailed Errors".
Note that the same steps apply for IIS 8.0 (Windows Server 2012).
After trying Vaclav's and Alex's answer, I still had to disable "Show friendly HTTP error messages" in IE
TLDR:First determine where in the pipeline you're getting the error from (scroll looking for screenshots of something that resembles your error), make changes to get something new, repeat.
If you are seeing the file located here...
%SystemDrive%\inetpub\custerr<LANGUAGE-TAG>\500.htm
...which generally looks like this:
**...then you know you are seeing the currently configured error page in IIS ** and you do NOT need to change the ASP.net customErrors setting, asp error detail setting, or "show friendly http errors" browser setting.
You may want to look at the above referenced path instead of trusting my screenshot just in case somebody changed it.
In this case, you are seeing the setting of <httpErrors> or in IIS Manager it's Error Pages --> Edit Feature Settings. The default for this is errorMode=DetailedLocalOnly at the server node level (as opposed to the site level) which means that while you will see this configured error page while remote, you should be able to log on locally to the server and see the full error which should look something like this:
You should have everything that you need at that point to fix the current error.
That leaves a couple of possibilities.
Change your site's httpErrors to "Detailed" so you can see it remotely. But if it doesn't work your error might already be a config error, see #3 immediately above. So you might be stuck with #4 or #5 and you're going to need somebody from your server team.
...and you expect to see something like this...
...then you need to change "Send errors to browser" to true in IIS Manager, under Site --> IIS --> ASP --> Debugging Properties
or this...
...you need to disable friendly errors in your browser or use fiddler's webview to look at the actual response vs what your browser chooses to show you.
If you see this...
...then custom errors is working but you don't have a custom error page (of course at this point were talking about .net and not classic asp). You need to change your customErrors tag in your web.config to RemoteOnly to view on the server, or Off to view remotely.
If you see something that is styled like your site, then custom errors is likely On or RemoteOnly and it's displaying the custom page (Views->Shared->Error.cshtml in MVC for example). That said, it is unlikely but possible that somebody changed the pages in IIS for httpErrors so see the first section on that.
In web.config under
<system.webServer>
replace (or add) the line
<httpErrors errorMode="Detailed"></httpErrors>
with
<httpErrors existingResponse="PassThrough" errorMode="Detailed"></httpErrors>
This is because by default IIS7 intercepts HTTP status codes such as 4xx and 5xx generated by applications further up the pipeline.
Next, enable "Send Errors to Browser" under the "ASP" section, and under "Error Pages / Edit Feature Settings", select "Detailed errors".
Also, give Write permissions on the website folder to the IIS_IUSRS builtin group.
try setting the value of the "existingResponse" httpErrors attribute to "PassThrough". Mine was set at "Replace" which was causing the YSOD not to display.
<httpErrors errorMode="Detailed" existingResponse="PassThrough">
One thing nobody's mentioned is as a very quick and temporary fix, you can view the error on the localhost of that web server.
Fot people who have tried EVERYTHING and just CANNOT get the error details to show, like me, it's a good idea to check the different levels of configuration. I have a config file on Website level and on Application level (inside the website) check both. Also, as it turned out, I had Detailed Errors disabled on the highest node in IIS (just underneath Start Page, it has the name that is the same as the webservers computername). Check the Error Pages there.
You may also verify that if you changed your main website folder (c:\inetpub\wwwroot) to another folder you must give read permission to the IIS_IUSRS group in the new folder.
Found it.
run cmd as administrator, go to your system32\inetsrv folder and execute:
appcmd.exe set config -section:system.webServer/httpErrors -allowAbsolutePathsWhenDelegated:true
Now I can see detailed asp errors .
If you run the browser in the server and test your url of the project with the local ip you have received all errors of that project without a generally error page(for example 500 error page).
In my case it was permission issue. Open application folder properties -> Security tab -> Edit -> Add
Double check the encoding of the asp file you are testing.
For instance if you created a file like below on a Windows Server Core 2019 :
echo "<%@ LANGUAGE=Javascript %>" > test.asp
echo "<%Response.Write("test");%>" >> test.asp
Then test.asp will be encoded in Unicode, and requesting it will produce a 500 without any details.
Do a notepad test.asp, then click on "Save As..." and choose "ANSI" encoding to fix it.
In my case MariaDB was throwing an error.
It was only much later that it would send it over to Windows Logs > Application > Waring as
Aborted connection (number) to db: 'xxx' user: 'xxx' host: '127.0.0.1' (Got an error reading communication packets)
