KAspersky Endpoint Security blocks some legitimate web sites

Userlevel 1
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hi. I don't understand why Kaspersky endpoint security blocks some web sites. Older version works perfect. It doesn't block any legitimate web sites. We have updated from to and blocking issue arised. please help me to solve this issue.

Best answer by Demiad 12 July 2019, 13:24

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Userlevel 7
Badge +7
What is the error message you are seeing in the internet browser?
You can check Critical (deny) events in the Reports window for find reason.
Userlevel 1
Hi Demiad. It is simple error message like ERR_CONNECTION_RESET. When I enter cisco or other real web sites, Kaspersky blocks them.

How can I check event in Reports? I checked almost all event in event viewer but failed to find.
Userlevel 7
Badge +7
Try uncheck "Scan encrypted connections" in "General Settings"\ "Network settings".
KB article (RU only) https://support.kaspersky.ru/15215
Userlevel 1
Thank you Demiad. Could you please tell me whether Kaspersky recommend to uncheck "Scan encrypted connection" ? now it is checked in our server but I afraid to uncheck it because of security issue
Userlevel 7
Badge +7
"Scan encrypted connections" enable Full SSL inspection.

If the check box is selected, the Web Threat Protection, Mail Threat Protection, and Web Control components scan encrypted traffic that is transmitted over the following protocols:
  • SSL 3.0.
  • TLS 1.0 / TLS 1.1 / TLS 1.2.

Userlevel 1
So as I understood that it is a functionality that shouldn't be turned off. instead when web pages got blocked we have to add to TRUSTED DOMAIN list. right?
Userlevel 7
Badge +7
Yes, problem sites must be add to "Trusted domains"
Some sites already added to the Kapersky Lab global list.

Userlevel 1
Thank you so much. I appreciate your help
We are having the same problem since the latest upgrade. The 'Machine Learning' is blocking about 10-20 sites a day that are safe and legitimate. We should not have to spend our working day whitelisting domains.
Userlevel 7
Badge +11

This is because of the new module included in version 11.1 of the analysis of encrypted connections.

This module can be found in the following section of the directive> general configuration> network configuration.

If when analyzing a url, it does not find in a clear way a signed security certificate, it emits that message, the solution is to add the domain to Trust.