Symptoms
In rare instances, a limited number of devices in managed IT environments—and some advanced home setups using NAS (Network Attached Storage) devices—running applications that use SMB (Server Message Block) might experience longer-than-usual file access times for transfers and read operations.Â
This occurs only when all the following conditions are present:Â
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The SMB client device where the application is running uses Windows 11, version 25H2 or Windows 11, version 24H2.
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The application connects to a remote SMB server that is either a non-Windows SMB implementation (such as Linux, Samba, NAS devices, or third-party storage appliances) or is running a Windows version released prior to Windows Server 2019 (such as Windows Server 2016).
In environments where this specific interaction takes place, file access might take longer and could affect application performance. In some cases, this might extend to hours depending on the number of files being accessed, not their size.Â
Note: This issue is unlikely to affect individuals using devices in typical home or personal settings. However, advanced home configurations using NAS devices or other non-Windows SMB servers may also be affected. It primarily impacts enterprise scenarios where SMB is used for file sharing, printing, or server-based workloads.Â
Status
Microsoft is working to release a resolution for this issue in a future Windows update. Additional details will be provided as they become available.
