Category Archives: Skype for Business Server 2015

File Transfer is turned off – Skype for Business Server 2015 Upgrade

After upgrading from Lync Server 2013 to SfB Server 2015 we tried copying and pasting images into IM windows and got the message that File Transfer is turned off.


I logged into the Lync FrontEnd server to run the command Get-CsFileTransferFilterConfiguration and the action was set to block.


Next I started up the SfB Control Panel to look at the Global Policy for FileSharing under IM and Presence, and what I see is that nothing is blocking PNG files, or JPG files, so why can’t I send files?  I also tried allowing peer to peer file transfers under Conferencing, but that didn’t help either.


I ran wireshark on my PC when i was pasting the file/image into the typing area, weirdly enough I didn’t see any traffic going to Lync FE or Edge server, which tells me its a policy in the client that I need to update somewhere, since it isn’t even making it out of my computer.  I tested again, but send a regular text message over Skype and saw the packets go to the FE server.

Resolution: I ended up going to the Conferencing tab and modifying the Global and Desktop and Application Sharing policy to Enable peer-to-peer file transfer and then waiting for it to update and had to restart the Skype client on my PC and the users I was testing with before it started working.


Lync Server 2013 to Skype for Business 2015 Upgrade caveats and gotchas

After you complete the prerequisites, upgrade the FrontEnd pool, publish the new topology and actually run the SfB 2015 installer, the first window that pops up is to check Microsoft for SfB installer updates.  Foolish me clicked yes check for updates which in turn pulls down the latest CU that gets installed during the upgrade process instead of installing the RTM and then installing the CU after.

The correct option is to “Don’t check for updates right now”

Error encountered: Error returned while installing OcsCore.msi(Feature_LocalMgmtStore), code 1603. Error Message: A fatal error occurred during installation. For more details please consult log at C:\Users\username\AppData\Local\Temp\2\Add-OcsCore.msi-Feature_LocalMgmtStore-[2018_04_23][21_57_03].log

To fix this I uninstalled what SfB components were installed which was only two.  I uninstalled Administrative Tools first, and then Core Components

Next I started the SfB installer again and selected “Don’t check for updates right now”, and was greeted with the original/legacy installer, and not the upgrade window.  I clicked Install or Update Skype for Business and went through the normal install process, installed certificates, and went to start the services.


During the startup of the services, the FabricHostSvc and RTCSRV services would not start.  I saw events for the Fabric service which were 23041, 53760, 53761.  I couldn’t find much online for this issue, but it ended up being the Windows Firewall service was disabled on the Lync Frontend service.  I enabled the Windows Firewall service, stopped and started all the SfB services, and then restarting the server and everything came back up.  The Windows Fabric service needs the Windows Firewall service enabled, but the firewall can still be off.