Sep 19 2017

No connectivity with the Skype for Business Web App

skype-for-businessWe seem to see to encounter a specific connectivity error a lot across a variety of Skype for Business environments.  In some instances, users will complain about slow connectivity or no connectivity.  The primary symptom is the following event log entry (repeated every 20 minutes or so) with Event ID 41029:
No connectivity with the Skype for Business Web App. Affected Web browser clients cannot use Web Conferencing modality.

Server Machine FQDN: lyncfrontend.yourdomain.com, 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.

The Root Issue
The application pool registered to the Lync Server External Web Site\Reach application is set to activate On Demand.  This results in an IIS application pool that is not spun up when an external reach request is received resulting in a connectivity fault.
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Sep 05 2017

Forcing Skype for Business client to download address book

skype-for-businessTo force Skype for Business to update the address book, execute the following cmdlet in Skype for Business Management Shell:

Wait for the LS Address Book Server event to report Event ID 21056 listing the Synchronization Pass Summary: Continue reading

Sep 05 2017

ERROR 1603: Server.msp had errors installing

ERROR-1603-Server.msp-had-errors-installing

I got an error when tried to install Skype for Business Server 2015 KB3207506 using Skype for Business 2015 Update Installer. Checking the log file mentioned in the error window above gave me the following:

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Aug 07 2017

How to install/uninstall Windows service

If you need to install your .exe file as Windows service using command prompt (not the Visual Studio command prompt) here is how you can do this in x32 and x64 versions of Windows. Continue reading

Jul 19 2017

Key Audio Quality Metrics Used in the Skype for Business Monitoring Reports

skype-for-businessHere are the 7 audio quality metrics I think the most effective for analyzing Skype for Business audio quality and what numbers represent an audio quality issue. Continue reading

Jul 06 2017

503 service unavailable compdyn.dll failed to load

After moving of IIS site to another server we started receiving 503 Service Unavailable error in browser. Event Viewer showed the following in Application Log:

Log Name:      Application
Source:        Microsoft-Windows-IIS-W3SVC-WP
Date:          7/6/2017 12:46:10 AM
Event ID:      2280
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:      <computer_name>
Description:
The Module DLL C:\Windows\System32\inetsrv\compdyn.dll failed to load.  The data is the error. Continue reading

Jul 05 2017

Exchange Unable to relay (in reply to RCPT TO command)

If you use Microsoft Exchange as a mail relay for other servers, and on the server from which you send mail, you have an error

Relay = exchangerelay.domain.com [10.10.10.10]: 25, delay = 5.1, delays = 0.04 / 0.01 / 0.05 / 5, dsn = 5.7.1, status = bounced (host exchangerelay.domain.com [10.10.10.10] Said: 550 5.7.1 Unable to relay (in reply to RCPT TO command))

Check the Exchange Relay Connector settings. You need to make sure that the IP address of your server is in the list of addresses from which mail is allowed to receive.

Open the Microsoft Exchange Console, navigate to Server Configuration -> Hub Transport

exchange-relay-connector Continue reading

Jul 04 2017

Skype for Business: decommissioning hybrid and go cloud only

Some situations require you remove server roles on particular server or even remove the whole Skype for Business infrastructure in case you decided to move all users and services to the cloud. Even if you already moved all users to the cloud simple turning servers off won’t be enough.

What is Skype for Business Hybrid? Skype for Business Hybrid is two independent federated domains with a shared SIP address space. The sharing of the namespace allows administrators to move users between the two deployments with their data and redirect sign-in requests to the correct deployment. In any Hybrid configuration, the on premises deployment is the source of authority for that service. Therefore, sign-in requests will come to the on premises Front End servers using DNS lyncdiscover and SRV records. The on premises Front End server redirects requests to the cloud service from the discovery phase in case the user’s SIP identity and service lives (courtesy of AD) in Office 365. This allows the user’s client to sign in directly to the online tenant using Microsoft Office 365 URLs.

Have a look at the following diagrams, illustrating Sign In workflows for Internal and External users:

Skype for Business Internal user to Cloud sign-in workflow Skype-for-Business-internal-sign-in Continue reading

Jun 08 2017

How to convert pfx certificate to Apache pem

Apache server requires the following two files for SSL configuration:

1 – Server.key : the private key associated with the certificate
2 – Server.crt :  the public SSL certificate issued by trusted authority

If you have one .pfx file instead of two above (in fact the .pfx is certificate + private key combined into one file) you can extract the private key from pfx and convert pfx to pem using OpenSSL with the following commands: Continue reading

May 30 2017

Enable Music on Hold in Office 365 Skype for Business Online

Since January 16th, 2016, Music on Hold is now available in Office 365 Cloud PBX and Skype for Business Online.

This is deployed via a client policy, using a remote PowerShell session. For instructions on how to connect to Skype for Business Online using PowerShell, click (here).

Once you are connected to the remote PowerShell session, you just have to run a single command Set-CsClientPolicy –EnableClientMusicOnHold $true

Skype-for-Business-enable-music-on-hold-in-office-365-cloud-pbx Continue reading

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