Microsoft Exchange and Active Directory Blog
During an Exchange 2016 to Exchange 2019 migration, no mailboxes could be moved to the new Exchange 2019 databases. The MoveRequests got stuck at 0% and showed the error StalledDueToSource_DiskLatency: No matter how big or small the mailbox was: No mailbox could be moved. Directly after creating the MoveRequest, the error StalledDueToSource_DiskLatency was displayed. Also ... Read more
During the migration from Exchange 2016 to Exchange 2019, I encountered the problem that Outlook constantly asks for username and password. A connection via Outlook to Exchange could no longer be established as soon as the DNS entry (or the load balancer) was switched to the new Exchange 2019 servers. However, OWA and ActiveSync worked without any problems. In ... Read more
A reader asked for an article on how brute force attacks on Exchange servers can be prevented. Since Exchange servers in smaller environments are often directly accessible on the Internet (e.g. via port forward) and can also be identified very quickly thanks to autodiscover, Exchange servers are very suitable for brute force attacks. In a brute force attack ... Read more
Windows Defender is activated by default on Windows Server 2016. As Exchange Server requires some exclusions from the virus scanner, these must also be stored accordingly in Windows Defender. The same applies to virus scanners from other manufacturers. The following note can be found on the Exchange Team Blog: Windows Defender is on by default in Windows Server 2016. Attention to ... Read more
