| Error Message | Likely Cause | Solution | |---------------|--------------|----------| | "Update files are corrupted" | Incomplete copy of .nup files | Re-copy mirror folder; compare file count. | | "Server not found" | Path contains spaces or special chars | Use short path: D:\eset\ not D:\my updates\ . | | "No update available" | Mirror older than client’s current DB | Run mirror tool on internet side to get newer files. | | "Digital signature verification failed" | Mirror tampered or outdated root cert | Delete mirror folder, re-download from ESET. |
ESET NOD32, by default, requires an active internet connection to update its virus signature database (often referred to as VSDAT or Update Module). However, in environments with restricted or no internet access (e.g., industrial control systems, military networks, isolated workstations), offline updates are critical. This report details the as the primary method, alternative manual update procedures, and inherent security limitations. nod32 offline update