Connecting to an unauthorized server allows the server administrator to log the IP addresses and version details of connecting clients. This data can be used for profiling or targeted attacks.
Searching for "ESET NOD32 free update server" often leads to fake lists containing IPs like: eset nod32 update server list free link
These are risky: They can deliver modified signature databases, spyware, or simply stop working after a few days. Connecting to an unauthorized server allows the server
Best overall free link: http://u10.eset.com (for North America)
Best legacy link (v4-6): http://um10.eset.com/nod32/
Best secure link: https://update.eset.com
Best offline solution: ESET Mirror Tool (free download on ESET.com) These are risky: They can deliver modified signature
After testing over 40 supposed "free update server links" from Reddit, Telegram, and cracking forums, only three categories worked reliably:
Do not pay for "private update server lists." They are either free public servers repackaged or malicious honeypots.