Lync/SfB Server: Event 41026, LS Data MCU after May 2017 .NET Framework update

Update 2017/06/28 – In Workaround #1 we also need to request new Front End certificates with Client and Server authentication in the EKU. Recently we notice that Lync Server 2010/2013 and Skype for Business Server 2015 Front Ends were generating the Events 41025 and immediately after the Event 41026: Log Name: Lync Server Source: LS… Read more

Lync/Skype4B Server: OAuthTokenIssuer, Assigned certificate not found or untrusted.

In a recent support case the OAuth certificate was missing in one of the Front Ends: We also notice the Missing message in the Deployment Wizard Step 3, for the OAuth certificate: And in PowerShell we had the following error when we tried to check the certificates: Get-CsCertificate https://technet.microsoft.com/en-us/library/gg398227.aspx Get-CsCertificate : OAuthTokenIssuer: Assigned certificate not found… Read more

SfB Server 2015: Cannot install Cumulative Update – Failed to create network share. (-2147467259 xds-replica)

In a recent support case we couldn’t install the Skype for Business Server 2015 Cumulative Update on a Edge Server: We checked the Skype for Business Core Components log file (OcsCore.msp-EDGESTD-[2017-03-21][15-30-48]_log.txt) located in %TEMP%: The log showed that the setup was aborted because it couldn’t create a file share: CreateSmb: Error 0x80004005: failed to create… Read more

Skype4B Server 2015: SIP/2.0 503 Service Unavailable

While working on a PSTN integration with Skype for Business Server 2015, we notice that the inbound calls were being rejected immediately with SIP/2.0 503 Service Unavailable: TL_INFO(TF_PROTOCOL) [festd\festd]6984.23A4::03/06/2017-22:56:29.167.0000245B (S4,SipMessage.DataLoggingHelper:sipmessage.cs(801)) [4223311279] >>>>>>>>>>>>Outgoing SipMessage c=[<SipTcpConnection_1ACDDA8>], 172.20.20.40:5068->172.20.15.39:56945 SIP/2.0 503 Service Unavailable FROM: “Joule Adams”<sip:09920156101;phone-context=PrivateUnknown@recore.lab;user=phone>;tag=f0d14b5566;epid=8CE36BBBAB TO: <sip:+449920207101@172.20.20.40;user=phone>;tag=9837f16c5d;epid=14123C3787 CSEQ: 12538 INVITE CALL-ID: 49bfd2ea-8753-4651-a8aa-d7b48d066d93 VIA: SIP/2.0/TCP 172.20.15.39:56945;branch=z9hG4bKdab2e468 CONTENT-LENGTH: 0 SERVER: RTCC/6.0.0.0… Read more

Lync Server: Event 41029 LS Data MCU – No connectivity with the Lync Web App

In a recent support case we were working on an issue where sometimes the users couldn’t use the Lync Web App. The troubleshooting started in the Event Viewer > Lync Server, we notice that we had a few errors: Log Name: Lync Server Source: LS Data MCU Date: 01/03/2017 15:00:43 Event ID: 41029 Task Category: (1018) Level:… Read more

Cannot Sign-in to Office 365 in SfB Control Panel – Exception of type ‘Microsoft.LiveID.IDCRL.IDCRLException’ was thrown

In a new Skype for Business Server 2015 lab we tried to sign-in to Office 365 in the Skype for Business Control Panel: But after a few seconds we got the following error message: We couldn’t log in to your Office 365 account. Please check the errors and then select OK to try again: Get-CsWebTicket: Exception of… Read more

Microsoft Teams: Desktop and Web Client Log Location

Microsoft Teams preview was recently released and to help troubleshooting we need to verify the log and media trace files. The Microsoft Teams Desktop Client logs are located in: Windows %AppData%\Microsoft\Teams\logs.txt Mac ~\Library\Application Support\Microsoft\Teams\logs.txt And the Media ETL traces are located in: Windows %AppData%\Microsoft\Teams\media-stack Mac ~\Library\Application Support\Microsoft\Teams If we use the Microsoft Teams Web Client we can download the… Read more

Skype for Business on Mac – Conversation History not working and other issues

Microsoft launched a few days ago Skype for Business on Mac, which can be downloaded here: https://www.microsoft.com/en-us/download/details.aspx?id=54108. The purpose of this article is to provide the best practices on configuring your environment to get the best experience with this client, these recommendations were provided by Microsoft Beta team. It’s important to understand that, to have… Read more

Missing Kerberos Account Assignments after SfB Server 2015 In-place Upgrade

Recently we were asked why in a multi site deployment the Kerberos Account Assignments disappeared on a global level, after a single site performed an In-Place Upgrade to Skype for Business Server 2015. When we look at the planning details for the In-Place Upgrade to Skype for Business Server 2015, it mentions that we need to have additional considerations… Read more

Script: Lync/SfB Server Certificate Store Validation

In a previous post, we published the checks/validations that we should do in the Certificate Store in the Lync/Skype4B servers. Checks to do in the Lync/Skype4B Certificate Store http://blogs.technet.com/b/uclobby/archive/2015/06/19/checks-to-do-in-the-lync-skype4b-certificate-store.aspx We decided to write a PowerShell with all these checks to make it simple to use. The script will be kept in sync with the post, meaning… Read more