Some XenApp 6.5 ZDC Replication Calculations

James Denne, a fellow Citrite, has written this great blog post I would like to share with you tonight.

With the approaching end of life date for XenApp 5, one of my customers is currently designing their XenApp 6.5 farm and asked for some assistance calculating the amount of data that would be replicated between each zone data collector.


Let’s detail the existing environment:

  • XenApp 5 Feature Pack 2
  • Hotfix Rollup Pack 7
  • 350 servers
  • 14 zones in 10 countries globally.
  • Core farm infrastructure (SQL publisher datastore, licence server) located in the same datacentre as the “UK 5″ zone.

Here are the zone names and the average number of user logons per day.

Read his entire post here.

Vulnerability in Citrix XenApp could result in denial of service

Severity: Low

Description of Problem

A vulnerability has been identified in Citrix XenApp that, when triggered, could result in a denial of service.

This vulnerability is present in all versions of Citrix XenApp, formerly known as Presentation Server, up to and including version 6.5.

Mitigating Factors

In order to trigger this vulnerability, an attacker would need to be able to directly access the XenApp server. When deployed according to established best practice, the XenApp server would not be directly exposed and an Internet-based attacker would not be able to trigger this vulnerability.

What Customers Should Do

A hotfix has been released to address this issue. Citrix recommends that affected customers install this hotfix, which can be downloaded from the following locations:

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