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Prevent ICA Client timeout during inactivity



I am attempting to use VS .NET(either J# or VB) to write a client executable which will prevent my web ICA client from timing out with the server when I leave my desk for an extended period of time. I am accessing the process(Outlook specifically) via main window title, but when I generate programmatic mouse/icon movement or sendKeys() to the process, the client still disconnects after the citrix server specified 15 minutes of no activity.

What specific events on the client side does the ICA client observe to determine that the connection is active? What programmatic events can I generate to prevent my client from disconnecting with the Citrix Server?

Here is the VB.net code thus far:

Option Explicit On

Imports System.Threading

Module Module1

Private procName As String = "\\Remote, 128-bit SSL/TLS."
Private fullscreenProcName As String = "Citrix ICA Client"
Private processes() As Process
Private proc As Process

Sub keepAlive()
Dim currentPosition As Point
Dim theCursor As Cursor

theCursor = Cursor.Current
currentPosition = theCursor.Position
Dim newPosition As Point
newPosition.X = 300
newPosition.Y = 300
theCursor.Position = newPosition
'Console.WriteLine("Mouse moved")
'MsgBox("Mouse is moved")
theCursor.Position = currentPosition

End Sub

Sub PreventTimeout()

processes = Process.GetProcesses
For Each proc In processes

If InStr(proc.MainWindowTitle, procName) <> 0 Then
'Send the <Enter> Key to the app
'MsgBox("App kept alive.")

ElseIf InStr(proc.MainWindowTitle, fullscreenProcName) <> 0 Then
'Send the <Enter> Key to the app
'MsgBox("App kept alive.")
End If

proc = Nothing


processes = Nothing

End Sub

Sub Main()
While (1)
'Prevent timeout every 9 minutes
End While
End Sub

End Module

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16 answers to this question

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Ica keepalive can be set from the serverside, without intervention from the clientside:

TCP Keepalive: (can also be set on clientside, and also boosts client-server traffic on the NIC)


ICA Keepalive:


Optimised setting for wan environments to minimise latency:


Also check all hardware like routers, firewalls and managed switches
for idle settings, and make sure they are not active.


HKLM\system\currentcontrolset\services\tcpip\parameters\interfaces\"ID for Adapter"

Add a dword value MTU with a value of 1492 decimal

(Default MTU for ethernet = 1500, for DSL = 1492, for ISDN = 576 )

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> So TCP Keep Alive did not work. Can I
> accomplish what I am trying to do programmatically?

Setting ICA keepalive on the citrix server, is generally accepted by the Citrix administrators community, and has even been built in as a feature in FR3.
Is there any chance that you can pusuade the administrator of the server, to activate this setting?

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> There is no way I can convince the Administrator.
> Can I set ICA Keep Alive on the client?

Not that i know of, sorry.

> Is the client trying to detect my mouse moving? A
> keypress? When I have the ICA Web client Outlook
> open, and I am working on other development, it does
> not close.

Could be, that the session is somehow picking up clipboard actions, or stuff like this, but i'm not sure.

Inactivity idle settings are also something an administrator can have set. (if idle for 30 minutes; break connection.)

I really think you're administrator should be much more helpfull to you. I he keeps refusing, ill show you a few way's to hack the server, and do it yourself.
This kind of administrators are besides strongheaded, also not very good at their job, making them an easy target. :-)

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