Microsoft Exchange and Active Directory Blog
I have just uploaded an updated version of the "Exchange Autodiscover Whitepaper". Since the behavior of Outlook 2016 in connection with Autodiscover has changed somewhat in November 2017, I have adapted the whitepaper accordingly. Outlook now prefers Autodiscover in conjunction with Office 365, which leads to problems if the user has an Office 365 account. Read more
Microsoft has published an article on Exchange Server and Spectre (speculative execution side-channel). As this is a vulnerability in the processors, Exchange Server is also affected. There are a few things to note. Microsoft writes the following: As these are hardware level attacks targeting x64-based and x86-based processor systems, all supported versions of ... Read more
The Exchange Message Tracking Logs are not only helpful to analyze MailFlow problems, but are also great for generating statistics. My script "Exchange Reporter" uses the message tracking logs to generate some statistics on received/sent mails. The Message Tracking GUI is also based on the Message Tracking Logs. The Exchange Reporter ... Read more
On Exchange 2016 servers, the following event is sometimes written to the application log every 30 minutes Source: MSExchangeDiagnostics Event ID: 1006 The performance counter '\\EXCHANGE\MSExchange Assistants - Per Database(msexchangemailboxassistants-fwdb)\Event Dispatchers Catching Up' sustained a value of '2.730,00', for the '30' minute(s) interval starting at '10.01.2018 19:39:00'. Threshold breached since '25.12.2017 21:09'. None Trigger Name:EventDispatchersCatchupQueueTrigger. Instance:msexchangemailboxassistants-fwdb This ... Read more
The previous article is now a little older, so here is an updated HowTo for installing Exchange 2016 from CU8 on Windows Server 2016. This HowTo is not an update of an existing installation, but a new/first installation on Windows Server 2016. A HowTo for updating Exchange installations ... Read more
After installing Windows Updates on an Exchange 2016 server, OWA stopped working on one of my test servers. The error message "Server error in application /owa" was displayed in the browser: In the event log of the server in question, the event with the event ID 2001 could be seen: [Owa] Failed to load SSL certificate. The event with the ... Read more
New updates have been released for all Exchange Server versions. Exchange 2010 is also included. Click here to download directly: Exchange Server 2016 CU8 Exchange Server 2013 CU19 Exchange Server 2010 UR 19 Click here for details of the changes: Exchange Server 2016 CU8 Exchange Server 2013 CU19 Exchange Server 2010 UR 19 ... Read more
In the event log of an Exchange 2016 server, the following error message with the source MSExchangeApplicationLogic may occur every hour: Source: MSExchangeApplicationLogic Event ID: 3018 Scenario[ServiceHealth]: GetConfig. CorrelationId: 6852d41c-26fb-4ef9-9f7a-ee9d25f780c7. The request failed. Mailbox: Url: https://officeclient.microsoft.com/config16?CV=15.1.1261.36&Client=WAC_Outlook&corr=6852d41c-26fb-4ef9-9f7a-ee9d25f780c7 Exception: System.Net.WebException: The underlying connection was closed: Unknown error receiving... -> System.ComponentModel.Win32Exception: The client and server cannot receive data. Read more
Microsoft already released a security update for Exchange 2013 and Exchange 2016 on 12.12.17. This is not the quarterly CU, but a fix for a vulnerability in Outlook Web Access (OWA). The CVE for the vulnerability can be found here: CVE-2017-11932 | Microsoft Exchange Spoofing Vulnerability The update is rated "Important". Microsoft describes ... Read more
Anyone who discovers the event with the ID 40025 in the Event Viewer of an Exchange Server has no immediate cause for concern, but should take action: Source: MSExchangeIS ID: 40025 Database "Database Name" ("Database GUID") has been offline-repaired (by eseutil.exe) one or more times in the past. However, although this ensures database-level logical consistency and may permit ... Read more
