There are many reasons for "500 Internal Server Error". Try to dig out the cause in server logs, if possible share it on forum.
Mean while you can give it a try by restarting the server, if clustered environment then execute kClusterDeploy.sh command in all your servers, finally execute kUpdateHtml.sh. This should fix most of the issue.
Cheers.. Utkarsh Mishra
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Turns out our site minder service on the web server had stopped Could you shed some light on what site minder does? This configuration was set up long before I started supporting it so this one is new to me.
I'm not sure if I understood your question correctly.
What it does? It provides the configuration capability to allow Single Sign-On abilities for users.
Just as for LDAP authentication users don't have to sign on to PPM a further time once they are authenticated against the Windows Domain Controller, Siteminder works in a similar fashion.
You can check the Installation and Administration Guide of the PPM-version that you are using to get more information in the section 'Implementing User Authentication' which explains in detail what it is.
The overview says fyi:
PPM Center uses a framework similar to Java Authentication and
Authorization Service (JAAS) to integrate with pluggable authentication schemes. Integration of PPM Center with CA SiteMinder and LDAP is supported. This chapter provides information on how to integrate PPM Center with SiteMinder and LDAP, as well as instructions on how to implement either
Web remote single sign-on or genericsingle sign-on (SSO) with PPM Center.