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Error ECP.4099

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My name's Pedro.


Lately, MANY customers was getting the ECP.4099 error, after they activate our ESET product.





 Already changed their DNS, connection, tried connection via 3g from their Smartphones, tested their product keys, verified firewall, windows defender, connection to ESET activation IP (ping MANY IPs from the KB332 list, all with 0 package loss) and still I can't activate. I really don't know what to do to help our customers.



Some of our clients after this failed attempt, has returned from v9 to v8, and they activated ESET product without any problems.


So, it's something wrong happening with some clients, only with products v9 and I don't know why.



Thank you very much,


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  • ESET Moderators

Hello Pedro,


Most of the cases is caused by incorrect proxy settings, issues with Internet connection and in case of older systems like XP by missing root certificates as well.


Regards, P.R.

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we had same experience here and its not a proxy setting,we erify proxy and we tested on many different computers and network.

problem was elswhere.


anyone know what went wrong cause on Eset , they all started to work after 1 week. same keys same computers.

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