In the last week, Microsoft have published about a significant zero day vulnerability in Exchange Server - you can read about it here. This attack required a valid username and password for one of the vulnerabilities to be executed. Microsoft have advised in their security guidance to disable RemotePowerShell for non-admins. In their article on Controlling remote … [Read more...]
Setup changes for Exchange 2016 and Exchange 2019
In April 2022, Microsoft released the latest CU for both Exchange 2016 (CU 23) and Exchange 2019 (CU 12). Microsoft have the release notes for both of these in the links below if you care to read them. Exchange 2016 CU 23 Exchange 2019 CU 12 With it came one minor but potentially troubling change if you are not aware of it. You see Microsoft changed the command line … [Read more...]
Exchange Bug Stops Mail Delivery in 2022
A little like the Y2K bug, it's been found that Microsoft have a bug in their malware filtering service that is part of Exchange 2016 and later that only started at midnight on Jan 1st 2022. The effect of this bug is that mail delivery stops entirely IF the Malware scanning filter is being used (which by default it is). Here's a sample of some of the messages you would have … [Read more...]
Why don’t my SQL logs shrink after a backup?
I get this question often from various levels of technical people. They typically have experience with Exchange servers, and they know that after a successful backup Exchange will truncate or cleanup it’s database log files. They mistakenly think that SQL will do the same. Let’s explore why each of these takes place and what is going on here. Historically … [Read more...]
Faster Mailbox moves on Exchange 2013
I’ve been involved in a large 2500 seat Exchange 2010 to Exchange 2013 migration and consolidation project recently. During the mailbox moves, I found that often the move requests were being stalled with a status of RelinquishedWLMStalled. I tried to change many things to improve the migration including modifying the MSExchangeMailboxReplication.exe.config file to … [Read more...]