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April 2024 Exchange Server Hotfix Updates – HU

Exchange April 2024 Hotfix Update

Want some updates to go with your updates?  That’s pretty much what you are getting with the April 2024 Exchange updates.  We can split the features which are part of the April 2024 release into two main areas:

  1. Fixing the multiple things that broke with the March 2023 Security Update (SU)
  2. Adding net new features

The April 2024 HU is available for the following builds of Exchange Server:

  • Exchange Serve
Read the rest “April 2024 Exchange Server Hotfix Updates – HU”
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Exchange 2019 CU14 Released (2024 H1)

Exchange 2019 CU14 Download

Exchange 2019 CU14 has been released to the Microsoft Volume Licensing Center and the public Microsoft Download site!  Exchange 2019 has a different servicing strategy than Exchange 2007/2010 and utilises Cumulative Updates (CUs) rather than the Rollup Updates (RU/UR) which were used previously.    CUs are a complete installation of Exchange 2019 and can be used to install a fresh server or to upd… Read the rest “Exchange 2019 CU14 Released (2024 H1)”

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End of Exchange 2019 Mainstream Support

Exchange 2019 Support Lifecycle Policy

Today marks the end of Exchange 2019’s mainstream support.  This will likely resurface the discussion about what do we do with on-premises Exchange, where is the next version and do we even still need Exchange Server if all mailboxes are in Exchange Online?  While there is a solution to removing the last Exchange Server from on-premises it does have it's caveats and considerations.  Please ensure … Read the rest “End of Exchange 2019 Mainstream Support”

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Exchange Unexpected InternalNLBBypass URL – RecoverServer

Exchange Server Unexpected URL RecoverServer

Reviewing the output of an environement's CAS Namespaces showed that there was an unexpecte URL present for the version of Exchagne that was installed.  With Exchange 2013 onwards InternalNLBBypassURL is not something that we need to set.  That was an Exchange 2007 and 2010 thing.

In the environment below note that there are couple of things that pique my interest.

Any thoughts?

Exchange WebServices Showing InternalNLBBypassURL

What is interesting i… Read the rest “Exchange Unexpected InternalNLBBypass URL – RecoverServer”

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Exchange 2019 CU13 Released (2023 H1)

Exchange 2019 CU13 Download

Exchange 2019 CU13 has been released to the Microsoft Volume Licensing Center and the public Microsoft Download site!  Exchange 2019 has a different servicing strategy than Exchange 2007/2010 and utilises Cumulative Updates (CUs) rather than the Rollup Updates (RU/UR) which were used previously.    CUs are a complete installation of Exchange 2019 and can be used to install a fresh server or to upd… Read the rest “Exchange 2019 CU13 Released (2023 H1)”

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Updated Guidance On Exchange Server Extended Protection

Extended Protection is set to Required on the OAB vDIR

Extended Protection (EP) was added to Windows back in 2009 as a new security feature. This feature enhances the protection and handling of credentials when authenticating network connections using Integrated Windows Authentication (IWA).

The update itself does not directly provide protection against specific attacks such as credential forwarding, but allows applications to opt-in to Extended Protect… Read the rest “Updated Guidance On Exchange Server Extended Protection”

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Exchange Server Extended Protection

Exchange Server Extended Protection

Extended Protection uses service binding and channel binding to help prevent an authentication relay attack. In an authentication relay attack, a client that can perform NTLM authentication (for example, Windows Explorer, Microsoft Outlook, a .NET SqlClient application, etc.), connects to an attacker (for example, a malicious CIFS file server). The attacker uses the client's credentials to masquer… Read the rest “Exchange Server Extended Protection”

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Remediate Exchange Security CVE-2022-21978

Remediate Exchange CVE-2022-21978

The May 2022 security update for Exchange Server 2013, 2016 and 2019 resolved CVE-2022-21978.  A common issue is that admins are only doing part of the work to address this CVE.  Yes they are installing the update, but are not reading the rest of the documentation which states that an additional command must be run.

The FAQ states:

Do I need to take further steps to be protected from this vulnerabilRead the rest “Remediate Exchange Security CVE-2022-21978”

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Implementing Exchange DownloadDomain Security

Implement Exchange DownloadDomain

In the field, I’m seeing multiple customers that are struggling to implement the DownloadDomain feature. It does require a little prep work and it is not as simple as just running a single command in Exchange to flip the setting on.

In order to mitigate and issue with OWA, it is necessary to create an additional CAS namespace that will be used for downloading attachments from OWA.  This will requir… Read the rest “Implementing Exchange DownloadDomain Security”

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Exchange 2019 Point of No Return

Exchange 2019 PrepareAD - The Point of No Return

When designing an upgrade strategy from an older version of Exchange to a newer one, a question that needs to be addressed is do we need to introduce a version of Exchange that may not currently be present?  This may be when upgrading from Exchange 2013 to Exchange 2019.  If that organisation currently does not have any Exchange 2016 servers, you need to evaluate if there may be a future requireme… Read the rest “Exchange 2019 Point of No Return”