Ever heard of the Web Interface Session Sharing Key? Probably not but my guess is some companies are having issues with it without knowing. Of course they see sessions are not sharing and even open different sessions on the same XenApp server. I wrote an article about Understanding Citrix Seamless Engine some years ago and the article explains sharing issues with published applications but the Web Interface session sharing key is another story that I will explain here.

The Session Sharing Key plays a role when:

• Using StoreFront/Web Interface site and Citrix Receiver/Workspace App at the same time
• Using StoreFront/Web Interface site to launch a session Desktop and within Citrix Receiver/Workspace App
• Using StoreFront/Web Interface site to launch a VM Desktop (XenDesktop) and within Citrix Receiver/Workspace App

Many Citrix or terminal server farms have problems with printer drivers and sometimes even the Administrator is not aware of that. Drivers that are not 100% multiuser aware can have a bad influence in many different ways. Often those buggy drivers can slow down the login process or cause high CPU consumption. In worst cases, printer drivers can even stop the login process for the whole server, kill the spooler service or can cause a blue screen of death (very rare with Windows 2003 and up). For the first two issues, the Citrix health monitor can help tracking the problem.

Ever heard of "context switches"? If yes, then you are probably an Administrator for a Citrix Presentation Server farm. Now this is not a Citrix related problem but the context switches are one of the default performance counters in the Citrix Resource Manager and obviously the most often raised alert. Other systems might also have issues with context switches but if there isn't an alerting monitor you will never know.

One of the benefits of a third-party add-on product to Terminal Services such as Citrix MetaFrame Presentation Server is published applications with seamless windows. In fact the default setting for MPS 3.0 is to only allow users to access remote servers via published applications.

TThe Windows logon and logoff process is a complex part of a Terminal Server environment, and these processes are complicated even more when Citrix MetaFrame Presentation Server is installed. However, knowing how these processes really work can cut down your troubleshooting time.

This article can’t cover all aspects and every detail of the logon and logoff processes. However, it will take a look at these processes from an administrator’s standpoint (as opposed to taking a developer’s perspective).

The first part of this article covers the session initialization. It covers the steps that take place from the time a client tries to connect until the application shows up on the user’s desktop. (Note that we’re only talking about the actual connection from the client to the server. We are not talking about application enumeration or load balancing since those activities take place before a client connects to a server.)

The second part of this article will cover the disconnection and logoff processes.