Microsoft released optional security updates Tuesday for various versions of the .NET Framework that prevent the RC4 encryption algorithm from being used in TLS (Transport Layer Security) connections.

Microsoft is officially moving to shut the door on RC4 - a legacy cryptographic cipher that has quietly persisted inside Windows authentication environments for decades - and forcing organizations to ...

Microsoft will enforce stronger Kerberos encryption in April 2026, removing RC4 support and potentially impacting enterprise setups.

In the Windows Release Health Message Center, Microsoft explains that the software fix for a security vulnerability in Kerberos initiates the hardening of Kerberos with RC4. The vulnerability itself ...

In April, Microsoft plans to start the next phase in the process of phasing out insecure RC4 encryption from Kerberos. Authentication in Active Directory is intended to become significantly more ...