You’re repeatedly prompted for Exchange credentials after you sign in to Lync

Issue

After you successfully sign in to Skype for Business Online (formerly Lync Online) by using Lync 2010 or Lync 2013, you may experience the following issues:

You receive a message in Lync that says it cannot connect to Exchange.

You're repeatedly prompted to provide a user name and a password to connect to Exchange. You may also receive the following message: 

Credentials are required

 

Note The message that you receive may vary, depending on which service Lync is trying to connect to. You may be prompted for credentials when Lync tries to connect to any of the following services:

Calendar and Free/Busy information from Outlook

Exchange Web Services (EWS)

Response Group Service

Address Book Service

Solution

Skype For Business : What is New

Microsoft has re-branded Lync 2013 Client as Skype for Business (SfB) Client and released that update on 14 April 2015. It will rebrand next version of Lync server as Skype for business (SfB) server 2015 and will release officially it on 1 May 2015. This article’s objective is to explain what new features it brings along.

Skype for Business: What’s New

Can not run DHCP utility in Windows Server 2012 for Lync 2013

Recently while deploying Lync 2013 for client I came across this little issue.

I copied  DHCPUtil.exe and DHCPConfigScript.bat files as usual to DHCP Server and try to run DHCPUtil.exe but got following error

 

 

To solve this issue, go to "C:\Windows\System32" on your Lync server and copy msvcp110.dll and msvcr110.dll and paste it in System32 folder of DHCP Server.



SIP Option from Mediation Server to Peer Gateway

1.1             Step 1

Lync Mediation server sends out SIP OPTIONS requests continuously to try to communicate with its next hop.

1.2             Step 2

Lync Room System ( LRS ) Configuration Guide

Microsoft has recently published document that guides you through provisioning Microsoft Lync Room System (Beta version) in Lync Server and Exchange Server

Click here to download it

Lync Edge Server - RSS configuration

One of the note on TechNet ( http://technet.microsoft.com/en-us/library/gg615015(v=ocs.15).aspx) recommends following

To improve the performance of the A/V Conferencing Edge service on your Edge Servers, you should enable receive-side scaling (RSS) on the network adapters on your Edge Servers. RSS enables incoming packets to be handled in parallel by multiple processors on the server. For details, see http://go.microsoft.com/fwlink/p/?LinkId=206013. For information on how to enable RSS, see your network adapter documentation.

Lync 2010 Server Version List

This is just copy/paste from one of the blog on TechNet I found very useful, ( Link to the blog
http://blogs.technet.com/b/hot/archive/2012/09/24/update-version-information-for-lync-server-2010.aspx)

Network Planning, Monitoring and Troubleshooting with Lync Server

Download Guide from Official Microsoft Download center

Lync Server 2013 is a real-time unified communications application that relies on an optimized network infrastructure to deliver high-quality media sessions. This guide provides a model for managing the network infrastructure for Lync Server 2013—planning, monitoring, and troubleshooting.

Provisioning Guide for Lync-Skype Connectivity

Download Provisioning Guide for Lync-Skype Connectivity from Official Microsoft Download Center.

Databases in Lync2010

 

Central Management Store ( CMS) 

•         Xds ( Maintains the Lync configuration as published by Topology Builder )

•         There is only one master copy of CMS database which is automatically installed on the first instance of a Standard or Enterprise Edition Lync pool. For Enterprise Edition pools this first instance will reside on the SQL back-end database for the pool

Pool Configuration Store

•         Rtc (stores persistent user data such as user contact lists, scheduled conferences, and access control lists)

•         Rtcdyn (stores dynamic Lync user data such as presence information.)

•         Rtcab & Rtcab1 (stores the raw Lync address book information (i.e. that is pulled from AD))

Application Store

•         Cpsdyn (stores dynamic system information for the Call Park application )

•         Rgsdyn (stores dynamic runtime operational information for the Response Group application)

•         Rgsconfig (stores persistent configuration data for the Response Group application )

Archiving and Monitoring Store

•         LcsLog (stores Instant Messaging and Conferencing data for archiving purposes)

•         LcsCdr (stores the Call Details Records (used by the Monitoring Role))

•         QoEMetrics (stores the Quality of Experience data (used by the Monitoring Role) )

Location Store

•         Lis (hold a network ‘wiremap’ that maps network elements (e.g. subnet, WAP’s, routers) to real civic addresses )

Force Lync2010 Client to update Address book

Step 1 : Update Servers

Run following command from Lync Server Management Shell

Update-CsAddressBook –Verbose

Step 2: Update Clients

Run following command from cmd ( run as an Administrator )

reg add HKLM\Software\Policies\Microsoft\Communicator /v GalDownloadInitialDelay /t REG_DWORD /d 0 /f

Exit the Lync client and delete the GalContacts.dband GalContacts.db.idxfiles from the user’s profile directory ( following location )

%userprofile%\AppData\Local\Microsoft\Communicator\sip_<username@domain>\

Log back in and Lync client will now update the address book.

UAG as Reverse Proxy for Lync 2010

Recently, I have to configure UAG as Reverse Proxy for Lync 2010 deployment and had lot of issue getting it work and there was not a great deal of help on internet. Finally, I got it working and i thought i should put up blog to save troubles for all of you.

Step 1 : Go through the Wizard ( UAG SP1 update 1) to publish Lync Web Services.



Make sure that HTTPS trunk is provisioned with a certificate containing all the public host names.

Step 2: Publish your Lyncdiscover service ( for mobility )

From the portal site click on "Add" on Applications,
















Step 3 : Change Trunk Settings