Exchange 2013 CU19

Exchange 2013 CU19 fixes:

  • 4046316 MAPI over HTTP can’t remove client sessions timely if using OAuth and the resource has a master account in Exchange Server 2013
  • 4046205 W3wp high CPU usage in Exchange Server 2013
  • 4046182 Event ID 4999 or 1007 if diagnostics service crashes repeatedly in Exchange Server 2013
  • 4056329 Can’t access EWS from Outlook/OWA add-ins via makeEwsRequestAsync in Exchange Server 2016 and Exchange Server 2013
  • 4045655 Description of the security update for Microsoft Exchange: December 12, 2017

Version

Build

KB Article

Download

UMLP

Schema Changes

Exchange 2013 CU19

15.0.1365.1

KB4037224

Download

UMLP

No

CPU usage is high when you use RPC over HTTP protocol in Windows 8.1 or Windows Server 2012 R2

Consider the following scenario that takes Microsoft Exchange Server 2013 as an example:

  • The Mailbox server role is enabled in Exchange Server 2013.
  • Exchange mailboxes use extended MAPI to communicate with the Exchange Server.
  • The extended MAPI uses Microsoft RPC over HTTP (remote procedure call over HTTP) protocol.
  • Many clients (such as mobile devices) are dropping connections to the Exchange Server.

In this scenario, the CPU usage on the Exchange server may reach 100 percent.\

Hotfix: https://support.microsoft.com/en-us/hotfix/kbhotfix?kbnum=3041832&kbln=en-US