HTTP server error 500 returned after Siteminder authentication and authorization

Document ID : KB000033279
Last Modified Date : 14/02/2018
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Upon accessing Single Sign-On (Siteminder) protected resources hosted on IIS, user is getting HTTP Server Error 500 after successful authentication and authorization.



  • Siteminder Web Agent logged the successful Siteminder authentication and authorization, but not the HTTP Server Error 500.
  • Web.config file (residing under the protected resource’s physical folder) registered missing partial precondition with the Siteminder Web Agent ISAPI filter:

<filter name="SiteMinder Agent" path="D:\Program Files\CA\webagent\win64\bin\ISAPI6WebAgent.dll" enabled="true" enableCache="false" preCondition="bitness64" /> 



Ensure that 32-bit or 64-bit Siteminder Web Agent ISAPI filter is defined in the web.config file accordingly, with the following format:

<filter name="SiteMinder Agent" path="C:\CA\webagent\win64\bin\ISAPI6WebAgent.dll" enabled="true" preCondition="classicMode,bitness64" />


<filter name="SiteMinder Agent-32" path="C:\CA\webagent\win32\bin\ISAPI6WebAgent.dll" enabled="true" preCondition="classicMode,bitness32" />