Should I Overwrite The Default Exchange SMTP Certificate?
When adding a TLS certificate on an Exchange server, the inevitable prompt will appear to enquire if you wish to overwrite the default SMTP certificate binding. While the UI in …
Azure Firewall Rule Not Working – Orange Triangle
The below is from a customer situation where an Azure Network Security Group (NSG) firewall rule entry was not working as they expected. This was was created to allow RDP …
Faulting Module Name NTdll.dll
One of my hosted lab environments ran into series of issues, and after unplanned maintenance there were multiple problems to resolve. The below error with a faulting ntdll.dll module was …
Microsoft Defender for Identity–Replaced Domain Controller
The below environment was migrated from one hosting provider to another. Unfortunately one DC did not survive, and it was removed from the domain. This was done by using dsa.msc…
Can You Fix This? Exchange 2013 Setup – Server-Gui-Mgmt-Infra Isn’t Installed
There was a request to fix the issue below when installing Exchange 2013 CU23. When running setup the error received was “Installing Exchange Error – Server-Gui-Mgmt-Infra isn’t installed“.
If …
April 2021 Exchange Security Updates
Today is patch Tuesday for April 2021 and there are critical Exchange server security updates in the release. You can review all of the affected products on the MSRC blog…
Exchange & TCP/IP Port Range
The below is an interesting result after installing Exchange. The act of installing Exchange will change how TCP/IP operates on the server with respect to ephemeral connections.
This may manifest …
Exchange Setup Fails – Error 3221685616
The saying goes that nothing monitors AD better than Exchange. While the symptom is an Exchange issue, the underlying root cause is typically something else. Though as an added “feature” …
QuickTip – Query Block Mode
Exchange 2010 SP1 introduced the concept of block mode or granular replication. This minimised the time taken for transactions on the active node to be replicated to passive nodes. Since …
Intermittent Azure DNS Resolution Issues With With New Domain Controller
The default option for DNS resolution on an Azure virtual network is to use the Azure DNS service. This is perfectly fine for regular Internet requests, if you need …