After many posts to this list, Citrix support calls, Novell/Zen reinstalls related to "Domain controller not found" and "You do not have access to logon to this session" errors intermittently showing up. I finally stumbled on NALEXPRS.DLL being optimized by TScale as the source of the issue. Excluding this DLL from optimization resolved these issues. This has been a Public Service Announcement. -Matt ******************************************************** This Weeks Sponsor RTO Software Do you know which applications are abusing your CPU and memory? Would you like to learn? -- Free for a limited time! Get the RTO Performance Analyzer to quickly learn the applications, users, and time of day possible problems exist. http://www.rtosoft.com/enter.asp?id=320 ********************************************************** Useful Thin Client Computing Links are available at: http://thin.net/links.cfm *********************************************************** For Archives, to Unsubscribe, Subscribe or set Digest or Vacation mode use the below link: http://thin.net/citrixlist.cfm