789 is a network and remote service result. Microsoft’s system-code table describes this value as: “{Delayed Write Failed} Windows was unable to save all the data for the file %hs; the data has been lost. This error was returned by the server on which the file exists. Please try to save this file elsewhere.”
Code reference and safe checks
Read the exact screen and operation before selecting a repair. This page does not run commands or collect files, keys or logs.
What this value means
Microsoft’s system-code table describes this value as: “{Delayed Write Failed} Windows was unable to save all the data for the file %hs; the data has been lost. This error was returned by the server on which the file exists. Please try to save this file elsewhere.”
ERROR_LOST_WRITEBEHIND_DATA_NETWORK_SERVER_ERROR is a Win32 system result, usually returned to an application or API caller. It is not a Windows blue-screen code or a diagnosis of the whole PC.
| Code | 789 |
|---|---|
| Hex form | 0x315 |
| Symbol | ERROR_LOST_WRITEBEHIND_DATA_NETWORK_SERVER_ERROR |
| Windows family | Win32 system codes |
| Source level | Microsoft code and symbol entry |
This is a system message template. The reporting program may substitute a file name, path, device or other value for its placeholders.
Safe next steps
- For 789 (ERROR_LOST_WRITEBEHIND_DATA_NETWORK_SERVER_ERROR), record the exact server, share, or network operation and whether another trusted device can reach it.
- Check the connection, address, VPN, proxy, and service status using the approved settings for that network. Keep work or school policies intact.
- If the endpoint is managed, give its administrator the code and time rather than changing security settings blindly.
After one step, repeat the original operation and record whether this same code returns. A different code needs a fresh interpretation.
What this code cannot prove
The source establishes the identifier and reference meaning. It does not establish the cause on your specific PC.
If the result differs from the documented message or a repair could remove data, stop and use the official source or vendor support.
Official reference and verification
Source type: Microsoft code and symbol entry. Checked against the source set on Nov 2, 2026.
The reference gives the meaning of this identifier. It does not inspect your PC or guarantee that one repair will work.