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ERROR_CSCSHARE_OFFLINE
CSC is the Windows Offline Files subsystem. It can intercept remote-file requests and serve cached content when UNC prefix resolution or remote access fails for a path that was made available offline. That means a user can sometimes read cached files while the online share itself is unavailable.
Microsoft documents that UNC path components are checked for availability and that CSC can provide cached content after the redirector path fails. Diagnose both the online share and cache state: a cached copy is not proof that the server/share is healthy, and deleting the cache can destroy the only locally available copy before synchronization is understood.
Online/share versus cache state
- Test direct online access to the full UNC path and each relevant share/DFS prefix.
- Determine whether the path is pinned or otherwise present in the Offline Files cache.
- Inspect synchronization status and conflicts before clearing CSC data.
- Verify share caching mode and permissions needed to traverse the UNC path.
Offline Files cache interface · Microsoft Offline Files synchronization behavior · Windows MUP and UNC prefix resolution
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