Kill an SP session with a HTML redirect:
<meta http-equiv=”REFRESH” content=”0;url=https://shib.example.org/Shibboleth.sso/Logout”>
Kill an SP session by visiting a URL:
Kill an IDP session:
Single Log off is not fully supported in Shibboleth, it is recommended you redirect a user to a page requesting they close their browser window.
Note: Don’t forget to replace example.org with your domain