Microsoft has released security updates (SUs) for vulnerabilities found in:
Exchange Server 2013
Exchange Server 2016
Exchange Server 2019
IMPORTANT: Starting with this release of Securit...
Updated May 27, 2022
Version 21.0
Blog Post
We're seeing MSExchangeApplicationLog Event 6006 at a customer site after upgrading to CU23.
Failed to download manifest file from CDN because of exception 'The underlying connection was closed, the potential fix could be to disable TLS1.0/1.1 and enable TLS1.2 from the Registry Key of HKLM:/SYSTEM/CurrentControlSet/Control/SecurityProviders/SCHANNEL. Detailed exception details as follows : System.Net.Http.HttpRequestException: An error occurred while sending the request. ---> System.Net.WebException: Unable to connect to the remote server ---> System.Net.Sockets.SocketException: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 13.107.219.60:443
at System.Net.Sockets.Socket.InternalEndConnect(IAsyncResult asyncResult)
at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)Any idea on what is causing this and what exactly is tried to download?