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Go through this article and check if u meet all requirements for the device to connect to Citrix:<br />
<br />
<a href="http://support.citrix.com/proddocs/index.jsp?lang=en&topic=/receiver-iphone-2/iphone-receiver-admin-requirements-101.html" rel="ugc">http://support.citrix.com/proddocs/index.jsp?lang=en&topic=/receiver-iphone-2/iphone-receiver-admin-requirements-101.html</a>
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Go through this article and check if u meet all requirements for the device to connect to Citrix:

http://support.citrix.com/proddocs/index.jsp?lang=en&topic=/receiver-iphone-2/iphone-receiver-admin-requirements-101.html [http://support.citrix.com/proddocs/index.jsp?lang=en&topic=/receiver-iphone-2/iphone-receiver-admin-requirements-101.html]

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I believe my configuration meets all of those requirements.
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I believe my configuration meets all of those requirements.

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When I try to connect to the Citrix server with this Android phone it prompts for a password but then says:<br />
<br />
Application Unavailable<br />
The requested application is not available at this time.<br />
Retry Cancel<br />
<br />
I can connect to a different Citrix server with this phone without an issue. I had a similar problem to this previously that was addressed in this thread:<br />
<br />
<a href="https://www.experts-exchange.com/questions/26324128/Citrix-Receiver-with-iPod-Touch.html?sfQueryTermInfo=1+10+30+citrix+ipod+receiv" rel="ugc">https://www.experts-exchange.com/questions/26324128/Citrix-Receiver-with-iPod-Touch.html?sfQueryTermInfo=1+10+30+citrix+ipod+receiv</a><br />
<br />
My problem now is that I just setup another Citrix server using an evaluation copy of Xenapp Fundamentals. I am able to connect from a desktop to the web interface of it without a problem. I even created the pnagent site under the web interface. I don't know where to go with this from here. Any help that I could get would be greatly appreciated. 
</div>
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When I try to connect to the Citrix server with this Android phone it prompts for a password but then says:

Application Unavailable
The requested application is not available at this time.
Retry Cancel

I can connect to a different Citrix server with this phone without an issue. I had a similar problem to this previously that was addressed in this thread:

http://www.experts-exchange.com/Apple/Hardware/iPhone/Q_26324128.html?sfQueryTermInfo=1+10+30+citrix+ipod+receiv

My problem now is that I just setup another Citrix server using an evaluation copy of Xenapp Fundamentals. I am able to connect from a desktop to the web interface of it without a problem. I even created the pnagent site under the web interface. I don't know where to go with this from here. Any help that I could get would be greatly appreciated. 

Cannot Use Citrix Receiver to connect Android Phone to Citrix Xen App Applications

Citrix is the synonym for the virtualization and application infrastructure systems developed by the company of the same name. Main areas are application virtualization, Software-As-A-Service (SaaS), cloud-computing and networking. The two most well-known are Citrix XenApp or Citrix CloudPlatform.

Citrix

A cellular phone (also known as a mobile phone, cell phone, hand phone, or simply a phone) is a telephone that can make and receive telephone calls over a radio link while moving around a wide geographic area by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network. Mobile phones that offer services such as text messaging, email, Internet access, business applications, gaming, photography and more general computing capabilities are referred to as smartphones.

Cell Phones

Remote access may refer to the connection to a data-processing system from a remote location, for example through a virtual private network remote desktop software, terminal emulation, or the activation of features of a business telephone system from outside the business's premises.

Remote Access

Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets. Android's user interface is based on direct manipulation, using touch gestures that loosely correspond to real-world actions, such as swiping, tapping and pinching, to manipulate on-screen objects, along with a virtual keyboard for text input. In addition to touchscreen devices, variants of Android are also used on notebooks, game consoles, digital cameras, televisions, automobiles and other electronics. Applications are usually developed in Java programming language using the Android software development kit (SDK), but other development environments are also available, including Delphi, Ruby and Visual Studio (using C++).