Showing posts from June, 2014

Lync Stress Test – How Too, Setup and Configuration (free eBook)

I extended the last Lync Stress Test Guide. Version 2.0

Now all important information are provided, incl. all parameters which can be modified and customized around all stress tests.

You can download the free eBook here:
Microsoft TechNet:

Table of Content:Introduction
The Calculation Process (I can recommend to you):
Build the Stress Test Lab
The Stress Test Process:
The Validation Process:
User Provisioning Tool
Setup User Provisioning Tool
User Creation
Contacts Creation
Distribution List Creation
Location Info Service Config
Run Configuration Scripts
Stress Test Simulations
User Profile Generator
Common Configuration
General Scenario
Voice Scenario
Reach Scenario
Mobility Scenario
Summary (Important User Load definition)
Table of Figures


Lync Stress Test - Key Health Indicators KHI (how to design/ define the server hardware requirements)

Since Microsoft released Lync Server 2013, there was one change in the planning document. No detailed SPECs were released so you could exactly calculate your server performance requirements.
Truly, there is the performance calculation sheet which provides you with a rough overview.

For this entire process you need the following tools and documents:
Lync Server 2013 Capacity CalculatorLync Server 2013 Stress Testing GuideLync Server 2013 Stress and Performance ToolKey Health Indicators: The Foundation for Maintaining Healthy Lync ServersPlanning a Lync Server 2013 Deployment on Virtual ServersLync Call Quality Methodology posterI provide you with the Lync KHI Performance Counter: Download here
The XML I have provide contains a consolidated Lync Frontend installation entirely on drive C: with 6 CPU core. If you have another setup, please add more CPU counter and if the SQL Server is installed on drive D:, please also add the I/O counters for this drive too.

But generally the server hard…

LS Data MCU Event ID 41029

Solving a conferencing component error.

LS Data MCU Event ID 41029
Conferencing modality.
Server Machine FQDN:, Port:8061
Server Type: External-WebApp-Edge [HTTP side error:The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel.]
If the problem persists this event will be logged again after 20 minutes
Cause: Service may be unavailable or Network connectivity may have been compromised.


This issue is related with your WAC, Office Web App Server.
Mostly, you need to validate this settings

Server FQDN spelling
check if WAC Server support only SSL
Check your Certificate Deployment on the WAC Server

This solves the issue.


Lync Voice Mail Survivability (SA) with Exchange Unified Messaging

The SBA is aware of the centrally configured Exchange Unified Messaging component. Additional it is important to understand the process of Voice Mail Survivability. While the VoicemailReroutingConfiguration in Lync provides the SBA with an alternative path, rerouted via PSTN to the central Exchange UM site.
The SBA is continuously check the SIP availability of the Exchange UM component, using the SIP OPTION based health checking. (Indeed, both SBA and non SBA Lync registrars act in the same way for all components, e.g. Exchange UM and other Gateway-SBC). Once the SIP OPTION command is sent, the sender expects an SIP 200 OK answer. Lync tries this health check several time even after it do NOT receive a 200 OK. As result of not receiving, the registrar will mark this target as DOWN and stop sending calls.

Note:You can drill down this process, if you us OCSLogger and Snooper catching the OPTION and 200 OK communication directly on the SBA.
Back to the Exchange UM, if Exchange is not respon…