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Issue with Eset and Firefox


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Hello all,

I have installed a 30 day trial of Eset antivirus and am experiencing the following issue.

I have enabled DNS over HTTPS using Cloudflare in Firefox settings. Most sites open fine but some site refuse to open since installing Eset.

Firefox shows the following error: Secure Connection Failed

An error occurred during a connection to www.kraken.com. SSL_ERROR_MISSING_ESNI_EXTENSION"

If I disable HTTPS scanning in Eset all sites open fine again. One site for example that refuses to load with HTTPS scanning enabled is hxxp://kraken.com

I'm running the latest version of windows 10 Home edition, Firefox 83, Eset 14.0.22.0

Anybody else able to confirm this issue?

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Appears you enabled; i.e. set to true, this setting:

FF_ESNI.thumb.png.cc8eb36a013b749493532f8366faed92.png

This feature in Firefox is experimental and always has been buggy. Set it back to the default false setting and you will have no issues with Eset in FireFox DoH mode. I can open this web site, http://kraken.com/ , w/o issue.

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42 minutes ago, itman said:

Appears you enabled; i.e. set to true, this setting:

FF_ESNI.thumb.png.cc8eb36a013b749493532f8366faed92.png

This feature in Firefox is experimental and always has been buggy. Set it back to the default false setting and you will have no issues with Eset in FireFox DoH mode. I can open this web site, hxxp://kraken.com/ , w/o issue.

Thank you, I forgot mentioning that I had enabled this settings. Disabling encrypted SNI indeed fixes this problem.

I think I enabled this setting around 2 years ago and personally never encountered any problems. During this time I have had both Kaspersky and Bitdefender installed with HTTPS scanning enabled without issue.

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  • 2 weeks later...

I'm on Windows 10 with the latest version of Firefox. I deleted my profile to start a fresh one and I seen Firefox looking like this. I didn't get a chance to see if this was occurring on the old profile as I was using Chrome. I thought it was weird because the profile is fresh. So I just uninstalled and installed the latest Firefox from the website. Same thing. It's like Javascript and images aren't loading. Fresh profile. Fresh install. No idea what's going on.

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1 hour ago, alexvennx said:

I'm on Windows 10 with the latest version of Firefox. I deleted my profile to start a fresh one and I seen Firefox looking like this. I didn't get a chance to see if this was occurring on the old profile as I was using Chrome. I thought it was weird because the profile is fresh. So I just uninstalled and installed the latest Firefox from the website. Same thing. It's like Javascript and images aren't loading. Fresh profile. Fresh install. No idea what's going on.

In this topic the SSL_ERROR_MISSING_ESNI_EXTENSION error was being discussed. It seems you don't have this issue so please create a new topic and enclose information if temporarily disabling protocol filtering make a difference.

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