Networking problems after the October 2026 Windows update? NTLM might be to blame
Legacy protocol is going to be axed, and enforcement by default will highlight how migration is going
Microsoft's October 2026 Windows update has caused networking problems for some users, and it seems the culprit might be the legacy NTLM protocol. As Microsoft phases out NTLM in favor of more secure alternatives like Kerberos, the update's enforcement of this change by default is highlighting the extent of the migration challenge. This is a significant development, as NTLM has been a staple of Windows networking for decades, but its vulnerabilities and limitations have made it a prime target for deprecation.
The fact that NTLM is being phased out is no surprise, given its known security risks and the existence of better alternatives. However, the pace of migration and the impact on organizations that still rely heavily on NTLM are critical concerns. As Microsoft continues to enforce the shift away from NTLM, users can expect to see more disruptions, especially in environments where legacy systems and applications are still prevalent. This situation underscores the importance of staying up-to-date with modern authentication and authorization protocols.
What's next to watch is how Microsoft handles the transition and whether organizations can adapt quickly enough to avoid further disruptions. As the industry continues to move towards more secure and robust authentication methods, we'll be keeping an eye on the progress of NTLM's deprecation and the adoption of its replacements. Additionally, we'll be monitoring Microsoft's communication and support for organizations navigating this change, as a smooth transition will be crucial for maintaining network security and stability.
Originally reported by theregister.com. NetNewsletter adds analysis for ai & agent economy readers.