


– Request new Edge Internal certificate with the Client and Server Authentication – uninstall the May 2017 Security and Quality rollup for the. Impact level: low. Web conferencing service (whiteboard, powerpoint presentations ).Īccording to MS: “The issue has been reproduced on Lync 2010, Lync 2013 and Skype for Business 2015 on all supported server versions (2008r2, 2012, 2012r2).” Workarounds “ This update adds an additional check on Enhanced Key Usage (EKU), since all Lync/ SfB Server usually use the Web Server template they will only have the Server Authentication in the EKU.“ Impact and affected systems The issue seems to be some secure hardening on the TLS negotiation.Īccording to MS Support, it looks like an ‘update blooper’ on the May2017 patch: The error code of the last failure is 0x80072746” Edge servers : “Web Conferencing Server connection failed to establishOver the past 3 minutes Skype for Business Server has experienced incoming TLS connection failures 1 times(s).Front-end servers: (Event ID 41026/41025) “No connectivity with any of Web Conferencing Edge Server, External Skype for Business clients cannot use Web Conferencing modality”.
