All news with #smbv1 tag

Mon, September 15, 2025

Microsoft: September Windows Updates Break SMBv1 Shares

#Security Advisory #Microsoft #Patch #SMBv1 #Windows 11 #Windows 10 #Windows Server

⚠️Microsoft confirmed that the September 2025 Windows security updates can break connections to SMBv1 shares when NetBIOS over TCP/IP (NetBT) is used. The issue affects client releases (Windows 11 24H2/23H2/22H2, Windows 10 22H2/21H2) and server releases (Windows Server 2025, 2022) and may occur if either the SMB client or server has the update. As a temporary workaround, administrators are advised to allow SMB traffic on TCP port 445 so Windows can switch from NetBT to TCP. Microsoft is investigating and developing a fix.