While installing Citrix SSO 4.8 in a test environment in combination with Windows Server 2003 and Citrix XenApp 5 for Windows Server 2003 we noticed that the Citrix servers were affected by this installation. The user sessions were taking more memory than before the installation of Citrix SSO. While investigating this issue we noticed that the memory usage was growing as the session was longer active. So Citrix SSO 4.8 had a memory leak, Citrix already had a fix for this in the SSOP480WX86001 (Version 4.8.6501.0) – For Citrix Single Sign-on Plug-in 4.8 x86 hotfix which fixes the following: