Cannot Connect to the Xenapp Server. Protocol Driver Error

Posted on 2009-04-21
Medium Priority
Last Modified: 2012-05-06
Hi Guys,

I have number of users experiencing an intermittent problem when logging on to Citrix via the Web Interface (we are using a CAG).

They get the error "Cannot Connect to the Xenapp Server. Protocol Driver Error". During testing  - I published a desktop to just one specific server in the farm. Sometimes it connects successfully, sometimes it fails. If it fails - it will log on successfully with a little patience and persistance.

Session Reliability is turned off on the WI.

Any suggestions?


Question by:boppaluccio1
  • 2
  • 2
LVL 11

Expert Comment

ID: 24210521
Did you confirm proper routing between all clients and server? Ports open accordingly (1494 with no SR turned on)? Also is this using the latest client?

Author Comment

ID: 24266921
Sorry for the delay in getting back to you pfcj.

Routing between clients and server is fine ports are open appropriately and SR has been turned off. Latest version of the client and happens issue for multiple clients, probably all clients, from numerous locations inside and outside of the company.

In my test scenario: I'm logging into the web interface via the CAG from my desktop. When launching an application published  only to me and to only one server, it seems to be completely random whether or not it successfully launches or gets the error. We've only one CAG in this setup and nothing changes between attempts to launch. It might work - 5 times in succession then fail, or might fail 5 times in succession, then work. Issue is intermittent and seems random which is making it difficult to nail down.

I've also tried the same test scenario with another published app, from an alternate desktop and locking it down to a different Citrix server - same intermittent issue.
LVL 11

Expert Comment

ID: 24273162
Any eventlog entries on the WI/CAG that may point to an issue?

Accepted Solution

boppaluccio1 earned 0 total points
ID: 25781451
Rebuilt the CAG

Featured Post

Free learning courses: Active Directory Deep Dive

Get a firm grasp on your IT environment when you learn Active Directory best practices with Veeam! Watch all, or choose any amount, of this three-part webinar series to improve your skills. From the basics to virtualization and backup, we got you covered.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

ADCs have gained traction within the last decade, largely due to increased demand for legacy load balancing appliances to handle more advanced application delivery requirements and improve application performance.
How to install and configure Citrix XenApp 6.5 - Part 1. In this video tutorial we have explained step by step installation of Citrix XenApp 6.5 Server on Windows Server 2008 R2 is explained in this video. We have explained the difference between…
This demo shows you how to set up the containerized NetScaler CPX with NetScaler Management and Analytics System in a non-routable Mesos/Marathon environment for use with Micro-Services applications.
Suggested Courses

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question