Client can not access programs in Citrix XenApp

I have a client with a Dell Latitude E5500 laptop running Windows XP Pro with SP3. When we try to access a particular application in the Citrix environment, which itself is accessed through the web interface, the error in the screen shot comes up.

"The remote session was disconnected because there are no Terminal Server License Servers available to provide a license. Please contact the server administrator"

The Citrix server itself is operated by another entity, thus I do not have access to it or any details on it. No other user so far is having this problem.

The user can access Citrix as well as the application from any other computer. I have uninstalled and reinstalled versions 11.1 and 12.0, never were they both on the system at the same time. Both of these versions have been validated by the entity operating the server as compatible with their setup.

The system was re-imaged recently. When the image was created, XenApp worked.

The same version XenApp 11.1, from the same install file, was recently installed on another user's laptop and works perfectly fine.

We've narrowed the problem down to just this one system. What do I need to do to resolve this?
Citrix.jpg
NMTSupportAsked:
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NMTSupportAuthor Commented:
I had failed to mention that the problem began spreading to other systems, with a couple more systems having this problem or other random problems that were originally thought unrelated or occurred after knowing the

The response form the entity running the server:

"Apparently, the server issuing licenses for the Citrix farm was not one of the Citrix Servers as we believed.  It was another server that we were in the process of removing from our DOMAIN.  As a result, the Citrix Servers were looking to the newly activated TS Licensing server for licenses and of course not receiving them.  We relocated the Citrix Licensing Server and redirected the Citrix farm to that server. "

Thank you all for your assistance in this matter.
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LKaushalCommented:
Try deleting MSLicense key from you client machine -->

On the Windows XP-Based Client
1.        Start Registry Editor (Regedit.exe).
2.        Locate and then click the following key in the registry: HKEY_LOCAL_MACHINE\Software\Microsoft\MSLicensing
3.        Delete the whole MSLicensing key from the registry.
4.        Quit Registry Editor.
5.        Test connection by connect to the server again.
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NMTSupportAuthor Commented:
I just got off of the phone with the end user. We removed the registry key through a remote session, but that did not resolve the problem.

Any other suggestions?
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bigbunk390Commented:
Does the users account or group the member is a part of have permission to the registry key HKEY_LOCAL_MACHINE\Software\Microsoft\MSLicensing

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NMTSupportAuthor Commented:
I was running this test under my own credintials, which is a member of the Domain Admins group, which does have permissions to that key.
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LKaushalCommented:
After deleting the Regkey and rebooting the box.. try login through local administrator and see if that Regkey is built again when you trying to access any Termninal server.
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NMTSupportAuthor Commented:
The key was automatically recreated.

I went to the site (about an hour drive) and brought it back after swapping the laptop out for another unit. When I returned, I found an email from the partner entity that owns the server. They discovered a virus that had slipped passed the antivirus software on the Citrix server.

They are updating it as I type this. More news to follow.
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Carl WebsterCommented:
NMTSupport, any update on this issue?
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NMTSupportAuthor Commented:
I'm trying to get an update from the entity that runs the server. Their Citrix admin was out of the office on Friday.

As soon as I know, I'll post that information.
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NMTSupportAuthor Commented:
I have received word that the problem was on the server this whole time. Between a combination of McAfee letting a virus through and some other, undisclosed as of yet, problems with the server, the local installation was not at fault.

I've requested more details about the server side fixes that resolve the problem and I'll post that information as it becomes available.
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