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ASHX 500 Handler Return Internal Server Error

I have an ASP.NET 4 asmx web service (IIS 7.5). It works https. I added an ashx handler. It works locally, but does not work on hosting. Return 500 Internal server error. What to do?

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ASP.Net will display 500 if you do not have the customErrors property set to everything, or it is set to On .

Add this to web.config to find out what the actual error is:

 <customErrors mode="Off" />

Once you know what the actual error is, you can fix it.

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I ran into this problem when I changed the application pool in IIS from classic to integrated. I solved this by adding a handler to the system.webServer file of the web.config file.

 <add verb="*" path="*.ashx" name="ImageFromDB" type="ImageFromDB" />


eg:

  <system.webServer> <handlers> <add verb="*" path="*.ashx" name="ImageFromDB" type="ImageFromDB" /> </handlers> </system.webServer>

This added 'ImageFromDB' to HandlerMappings in IIS.

This link was very helpful, pointing me in the right direction.

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Source: https://habr.com/ru/post/1484635/

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