Custom handlers for ASP.NET 2.0 Website in Classic mode in IIS 8.5 throwing 500 error

Question

I have ASP.NET 2.0 website running in Classic Mode. Server 2001/IIS 8.5. I get this error when calling custom handler (something.abc).

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I have my handler(something.abc) added to <system.webServer><handlers> section

<add name="Something.abc" verb="GET,HEAD" path="something.abc" type="ABC.MyHttpHandler, ABC" modules="IsapiModule" scriptProcessor="C:\Windows\Microsoft.NET\Framework\v2.0.50727\aspnet_isapi.dll" resourceType="Unspecified"/>

It was working fine in local IIS Express.

On Server when I changed the Application Pool setting: Enable 32-bit Applications= True it started working.

Question: Why I had to turn 32-bit mode and is there any way I can make it work without enabling 32-bit?

@ErikFunkenbusch I have the handler as above in my edited question. — gbs, Apr 02 '15 at 17:42
Oh, I see, so it's just the isapi dll. Well, you're using the one in Framework directory, not Framework64 directory, so it's 32 bit. — Erik Funkenbusch, Apr 02 '15 at 18:20

score 0 · Answer 1 · answered Jun 18 '18 at 17:31

I ran into this problem with an application running on a new Windows Server 2016 box with IIS 10.

It was working on the old Server 2012 box because that one had the 32-bit Oracle client installed, but the new server had the 64-bit Oracle client installed, and I was therefore unable to set Enable 32-bit Applications= True without causing other problems.

The worker process was also set up to use Classic pipeline instead of Integrated, another setting that I could not change in order to get this to work. ASP.NET was properly installed too. (i.e. this solution did not help me.)

I had:

<system.webServer>
  <validation validateIntegratedModeConfiguration="false" />
    <handlers>
      <add name="Something.abc" verb="*" path="something.abc" type="ABC.MyHttpHandler, ABC" resourceType="Unspecified" />

To solve this issue I added BOTH of these attributes (it did not work with only one or the other):

 modules="IsapiModule" scriptProcessor="C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll"

i.e. final result was:

<system.webServer>
  <validation validateIntegratedModeConfiguration="false" />
    <handlers>
      <add name="Something.abc" verb="*" path="something.abc" type="ABC.MyHttpHandler, ABC" resourceType="Unspecified" modules="IsapiModule" scriptProcessor="C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" />

Custom handlers for ASP.NET 2.0 Website in Classic mode in IIS 8.5 throwing 500 error

1 Answers1