Connection attempts on Xendesktop 7 fail intermittently using Wyse client and Storefront

eziemendorf used Ask the Experts™
We are having an intermittent connection issue and have gone through several troubleshooting steps with our vendor, Citrix and Wyse support. We are running out of ideas and are hoping it's not a firmware issue on the Wyse client. I thought I'd put it out to the experts and see if any of you can help. Here's what's going on:

We have a new Citrix Xendesktop 7 deployment for nonpersistant VDI desktops (workstation OS) and a few applications (server OS). We are using the newest Citrix Storefront to server up the web interface connections. We have 2 Storefront servers and 2 Delivery Controllers that are load balanced using round robin dns entries. We also use Profile Unity to manage several profile, registry and GPO options. Citrix servers are built on Windows Server 2012 r2 and the clients are Windows 7 x64.

All connections originating from a browser on a fat client work 100% of the time. Chrome, IE, and Firefox on Windows 7, 8 and 8.1 work every time. Fast and reliable.

The problem is when we connect using one of 250 Wyse Xenith c00x zero clients. Intermittently, when connecting on the latest firmware (and the previous one) after entering login credentials the connection never happens and the terminal reboots (which is it set to do at logoff). I'd say about 80% of the time we have no issue, but that's obviously unacceptable for a production environment. There are no errors in the Citrix Servers event logs, none in the Wyse terminal and no errors on the screen for the user. after a failed attempt future attempts will continue to fail. this will last anywhere from 1 minute up to 20 minutes of repeated failed login attempts and then suddenly it will work. If the user has a failed login and then goes to a fat client and logs in it will be successful and they can then log out and return to the Wyse client and log in successfully. Weird I know.

When a failed connection happens there is no record in the Delivery Controller (checked using Get-BrokerConnectionLog -Sortby establishmenttime). Also, there is no record in the Director Studio of a hung session or connection attempt.

We have tried firmware versions 2.0_105 and 2.0_210 which are the only 2 that support Citrix Xendesktop 7 and Storefront. The issue is present in both firmware versions. We are not running Storefront in Legacy mode, but we have tried that too, to no avail. We have checked, double checked, triple and quadruple checked the .ini file for the Wyse terminals and the settings have been confirmed as correct by Wyse. We also tried several settings and combinations that seemed to make sense but they all made no difference.

We have removed one of the Storefront servers and Delivery Controllers to eliminate the possibility of a  load balancing issue, even though EVERY connection though the web interface yields a positive result.

We have tried several other things that escape me currently but I will be glad to give more specifics to any questions you may have.
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KeithRetired IT Pro

I have the exact same environment, except I use V10LE and D10D WYSE terminals.  I also have the exact same issues, and the exact same frustrations.  I was all set to tell you to use ICA (or was it TCP) for the load balancing, but you went to single server, so I got nothing.  It does seem to me to be related to profiles, I can rename the user profile to .OLD, and she can log in first time, but the profile will eventually bloat again and stop at the WYSE term, just like you detailed.  It also seems to be user related, as the same users always have this issue, but most users are able to log in, but usually takes two tries.  It may also be related to mac.ini files, as my users with two screens that are unable to log in can go to another terminal with a single monitor and log in.  I have spent days on support with WYSE to no avail.

Things I know about this -

1.  Web interface works first time every time, so XenDesktop 7.1 is good.
2.  It is profile related, a new system created profile works every time for a week or so, then quits just like before.
3.  It is not the WYSE hardware.  Swapping the terminal offers no help, plus my test users log in first time every time on their WYSE terminal.
4.  It is user related.  The way they use their computer, always the same folks.

Can anyone add to this list?  I think I'm missing a piece.




We purchased HP t410 and t510 terminals to test and we get the same issue.

I ended up geting a higher level Citrix Support person to show me how to gather their logs and read the traces. What I have seen so far is that the session is being closed from the VM client machine and that it is a graphics error that has caused the session to terminate. After seeing this I disabled the Citrix Display Mirror Drivers (we have 2 installed for some reason) and updated our image to test.

I no longer have the same issue, I have a different one. Instead of the session never opening, it will open but I have no video - only audio. So i'm thinking the issue it with using (or trying to use) the Citrix Mirror drivers. By default I believe it should be using the Citrix WDDM Driver.

Any ideas on the correct driver setup up for Citrix XenDesktop 7.1 running on a Windows 7 64 bit VM on VMware vSphere 5.5 would be greatly appreciated.
KeithRetired IT Pro

I think we are on to something.  I now know one more thing -

5.  This is related to dual monitor sessions.

i.e. -  All the most highly affected users have dual monitors (and mac.ini files).  When their login fails, they can go to a single monitor machine and log right in.  Once in, they can return to their dual monitor machine and log in.  The session leaves the single monitor machine (disconnected).  The session does not move to the dual monitor machine, that machine returns to the login window.  They can return to the single monitor machine and log in, and the session returns instantly just as it should, still in the same screen as when it was disconnected.

Actually, I (and WYSE support) believe there are two issues, the stuttering login issue, and the exasperated login issue with dual monitor users.
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The issue was only present with dual monitors. We tested with a single monitor and everything was fine.

We tested several things but what works is this:
1. Uninstall VMware tools and the Citrix VDA.
2. Reinstall VMware tools WITHOUT the SVGA driver.
3. Reinstall Citrix VDA without HDX 3D Pro.
4. Create new snapshot and push to machine catalog.
5. Test

We've been running on this for about a week now with no issue.


I've requested that this question be closed as follows:

Accepted answer: 0 points for eziemendorf's comment #a39992360

for the following reason:

I solved the issue without assistance.
KeithRetired IT Pro

We have already done this, and we still have the issue.  Citrix and Wyse are working closely with me on this, give me time to find out if I need to do the VMtools thing again, but that took two days last time.

Has anyone found a solution to this problem? I have been experiencing this problem for six months now with no help from HP or Citrix. Any further information would be greatly appreciated.

Thank you!

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