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Hi,
The project was properly deployed on the server but I has the issue below. What to check it further?
Server Error
500 - Internal server error.
There is a problem with the resource you are looking for, and it cannot be displayed.
Check the normal stuff... start with the Event Viewer.
Keep in mind, you tagged this question with two completely different frameworks. If this is a Core application then turn on logging. See the official documentation.
I want to see the way to resolve it. How to identify the error?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(73.60000000000001, 90%, 17%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EZL%3C/text%3E%3C/svg%3E)
Hi @Peter_1985 ,
Whether your application is an Asp.net core application or a .Net Framework(.Net 4.X) application? Before deploying the application on server, whether the application works well on local environment? And it is better to explain more detail about the server environment, windows or linux, use IIS or not?
Hi,
It is under Windows server 2016. How to locate the exact error of this?
Hi @Peter_1985 ,
Before deploying the application on IIS, whether the application works well on local/Development environment?
Generally, when meeting the 500 error on IIS, we could refer to the following steps to narrow down the problem:
app.UseDeveloperExceptionPage(); stdoutLogEnabled and stdoutLogFile attributes of the aspNetCore element. Then in the output log file, check the log, you might find some useful information. More detail information, see Log creation and redirection. Best regards,
Dillion
Hi,
Where should we capture the error exception, regarding the current problem/error?
You still have not told us what kind of application you've build ASP.NET or Core. 500 errors after a deployment are commonly due to configuration errors. For example, the connection string is wrong.
As stated above, the first step is reviewing the Windows Event Viewer for errors.
If you cannot view the event viewer and this is a .NET Core web application then update the web.config to log errors.
Hi,
Can you help?
Hi @Peter_1985 ,
Have you ever tried the previous suggestion?
Besides, when you meet the 500 error? Access the specified page or the whole web site will show the 500 error?
Hi,
Can you have more code/details to make use of app.UseDeveloperExceptionPage()? Yes, I got the error when accessing the only one web page of the deployed project.
You've been given detailed instructions with links but there is no indication that you've followed the recommendations. Can you tell us what troubleshooting steps you've performed?
Can you have more code/details to make use of app.UseDeveloperExceptionPage()?
According to the definition of a 500 error, the server encountered an unexpected condition that prevented it from fulfilling the request. Depending on the error, the developer exception page might not help but it is worth a try. Did you deploy configuration that makes use of the developer exception page?
Yes, I got the error when accessing the only one web page of the deployed project.
Only one page causes the 500 exception? The other pages function as expected? Is there there any way you can share the all the relevant source code?
Hi,
There was no change to the relevant project but such issue did happen. Must I use exception to capture the exception?
Do you have the clear example to capture the exception? Can we catch it well within Page_load?
Hi @Peter_1985 ,
Do you have the clear example to capture the exception? Can we catch it well within Page_load?
It seems that your application is an Asp.net 4.X application(.net Framework), instead of an Asp.net core application. If you can tell us your application is an Asp.net 4.X Web Form application (it contains the Page_Load method), it might be easier for us to give you the correct direction or suggestion.
So, you can ignore my previous suggestion, because they are applying to Asp.net Core Application, instead of applying to ASP.NET 4.x. More detail information, see ASP.NET 4.x and ASP.NET Core or .NET vs. .NET Framework for server apps.
For Web Form application, after deploying meeting the 500 error, you can refer to this thread and enable the detailed error messages on IIS to check the detailed error message.
Best regards,
Dillion
Hi,
Yes, it is running v 4.0 ASP.net. How to identify the exact error of this? There was no change ever done but it did happen.
I want to confirm with you another question: before deploying the application on IIS, the application works well on local/Development environment or not?
Yes, everything was fine (currently before it happened).
I even did no change but this error did strangely happen.
It has been 7 days and we just figured out this is a Web Forms question. Secondly, there is no indication that you've followed any of the advice given on these forums or what troubleshooting steps you've performed.
I'm not sure how we can help you if you do not communicate with the community.
Hi ZhiLv,
Any other update on this?
Hi ZhiLv,
I tried to capture the exception via the condition (!IsPostBack) within Page_load, but I could not catch any exception from that.
Please see the answer from @PatriceSc
That web site documents the procedures that you need to perform to troubleshoot a 500 internal server error.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(230.39999999999998, 39%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EP%3C/text%3E%3C/svg%3E)
Hi,
For now see https://stackify.com/beyond-iis-logs-find-failed-iis-asp-net-requests/ and in particular #3 to first get details. http 500 means an error happens on the server when processing the request and so the first step is to understand which server side error happened.