If you try to install a secure connection with any site via https: // (for example, https://security.webmoney.ru) in the Google Chrome browser window you see the following picture, then you need to install root Certificate Kaspersky Anti-Virus Personal Root Certificate.

To do this, find the certificate on the computer along the path * R, and then in the menu Settings -\u003e Advanced Settings , In chapter NTTPS / SSL. Click on the button "Set up certificates" .
If you do not see such a folder - turn it on by next instruction.
* Note! The path may differ depending on the version of Kaspersky Lab antivirus installed.
If the path is different - it is better to establish the latest version of the antivirus. The probability is great that after that the problem will disappear itself, and all subsequent actions will not need to be performed.
Links to download the latest versions of Kaspersky Lab products:

** If it fails through the conductor to get to the certificate, turn on the display of hidden files and folders according to the instructions from articles.

To install the certificate, go to the tab and click "Import…",

To select a certificate file, click "Overview..".

Find a certificate file on the hard disk c: \\ ProgramData \\ Kaspersky Lab \\ AVP17.0.0 \\ Data \\ Cert \\ (Fake) Kaspersky Anti-Virus Personal Root Certificate.cer and click "Open"and then the button "Next\u003e".

Please note the default Certificate Storage must match the root certificate where the root certificate should be placed. If imports have been initiated from another section of the certificate storage, then you need to select the "Browse ..." button "Trusted root certification centers" And click the button "Next\u003e".

Then you should confirm the completion of the wizard by clicking the button "Ready",

next button "Yes", and finally, the button "OK".

To control the correctness of the proceeds in the window Certificates Open tab Trusted root certification centers And at the end of the list, locate the root certificate you set and open the certificate information window by pressing the button. "View". Make sure the certificate is valid.

Close all windows, restart the browser and check the certificate action by setting the secure connection.

If you try to install a secure connection with any site by https: // (for example, https://webmoney.ru.) In the Mozilla Firefox browser window, you see the following picture, and the installed Kaspersky Anti-Virus () reports that "it is impossible to guarantee the authenticity of the domain with which an encrypted compound is established. This certificate or certificate chain is built on an incredulous root center, "then you need to install in the Moxilla Firefox browser root Certificate Kaspersky Anti-Virus Personal Root Certificate.

To do this, find the certificate on the computer on the way * C: \\ ProgramData \\ Kaspersky Lab \\ AVP18.0.0 \\ Data \\ Cert \\ (Fake) Kaspersky Anti-Virus Personal Root Certificate.cer, and then in the Mozilla Firefox menu (at the top of the right - three horizontal lines), click "Settings - Additional - View certificates - certification centers". Then click "Import", in the window that opens, select the file "C: \\ ProgramData \\ Kaspersky Lab \\ Avp18.0.0 \\ Data \\ Cert \\ (Fake) Kaspersky Anti-Virus Personal Root Certificate.cer). Install it, putting a tick "trust when checking sites."
* Note! The path may differ depending on the version of Kaspersky Lab antivirus installed.
If the path is different - it is better to establish the latest version of the antivirus. The probability is great that after that the problem will disappear itself, and all subsequent actions will not need to be performed.
Links to download the latest versions of Kaspersky Lab products:

** If it fails through the conductor to get to the certificate, turn on the display of hidden files and folders according to the instructions from articles.

To control the correctness of the proceeds in the window View certificates Open tab CENTERS CERTIFICATION And find the root certificate you set, open the certificate information window by clicking the button "View". Make sure the certificate is valid.

On WebSites Which Are Supposed to Be Secure (The URL Begins WITH "http s.: // "), Firefox Must Verify That Certificate Presented by The WebSite Is Valid. If the Certificate Cannot Be Validated, Firefox Will Stop The Connection to the Website and Show a" Warning: Potential Security Risk Ahead "Error Page Instead.

This ARTICLE EXPLAINS WHY YOU MIGHT SEE SEC_UNROR_NKNOWN_ISSUER_MILLA_PKIX_ERROR_MITM_DEETECTED ORROR_SELF_SIGNED_CERT ERROR CODES ON AN ERROR PAGE AND HOW TO TROUBLESHOOT IT.

• For Other Error Codes on the "Warning: Potential Security Risk Ahead" Error Page, See The What do the Security Warning Codes Mean? Article.

Table Of Contents.

What Does this Error Code Mean?

During a Secure Connection, A WebSite Must Provide A Certificate Issued by A Trusted Certificate Authority to Ensure That The user Is Connected to the Intended Target and the Connection is encrypted. If you click the Advanced button on a "Warning: Potential Security Risk Ahead" error page and you see the error code SEC_ERROR_UNKNOWN_ISSUER or MOZILLA_PKIX_ERROR_MITM_DETECTED, it means that the provided certificate was issued by a certificate authority that is not known by Firefox and therefore can not be Trusted by Default.

The Error Occurs on Multiple Secure Sites

In Case You Get This Problem on Multiple Unrelated Https-Sites, IT Indicates That Something On Your System or Network Is Intercepting Your Connection and Injecting Certificates In A Way That Is Not Trusted by Firefox. The Most Common Causes Are Security Software Scanning Encrypted Connections Or Malware Listening in, Replacing Legitimate WebSite Certificates with their Own. In Particular, The Error Code Mozilla_PKIX_ERROR_MITM_DETECTED INDICATES THAT Firefox Is Able to Detect That The Connection is intercepted.

Antivirus Products.

Third-Party AntiVirus Software Can Interfere WITH Firefox "S Secure Connections. You Could Tryinstalling It, Which Might Trigger The Software Into Placring Its Certificates Into The Firefox Trust Store Again.

We Recommend Uninstalling Your Third-Party Software and Using The Security Software Offered for Windows by Microsoft:

• Windows 8 and Windows 10 - Windows Defender (Built-in)

If You Do Not Want To Uninstall Your Third-Party Software, You Could Tryinstalling It, Which Might Trigger The Software Into Placring Its Certificates Into The Firefox Trust Store Again.

Here Are Some Alternative Solutions You Can Try:

Avast / Avg.

In Avast Or Avg Security Products You Can Disable The Interception of Secure Connections:

1. Open The Dashboard of Your Avast or Avg Application.
2. Go to Menu and Click on Settings\u003e Protection\u003e Core Shields.
3. SCROLL DOWN TO THE CONFIGURE SHIELD SETTINGS SECTION AND CLICK ON WEB SHIELD.
4. Uncheck The Box Next To Enable Https Scanning and Confirm this by Clicking OK.

   In Older Versions of The Product You "LL Find The CorreSponding Option When You Go to Menu\u003e Settings\u003e Components and Click Customize Next To Web Shield

BitDefender.

In BitDefender Security Products You Can Disable The Interception of Secure Connections:

1. Open The Dashboard of Your Bitdefender Application.
2. Go to Protection and in the Online Threat Prevention Section Click On Settings.
3. Toggle Off The Encrypted Web Scan Setting.

   In Older Versions of The Product You Can Find The Corresponding Option Labelled Scan SSL WHEN YOU GO TO MODULES\u003e Web Protection

In BitDefender AntiVirus Free It "S Not Possible to Control This Setting. You can Try to Repair or Remove The Program Instead WHEN YOU" RE HAVING PROBLEMS ACCESSING SECURE WeBSITES.

For Corporate BitDefender Products, Please Refer To This Bitdefender Support Center.

BullGuard

In BullGuard Security Products You Can Disable The Interception of Secure Connections on Particular Major WebSites Like Google, Yahoo and Facebook:

1. Open The Dashboard of Your Bullguard Application.
2. Click On Settings and Enable The Advanced View on The Top Right of the Panel.
3. Go to Antivirus\u003e Safe Browsing.
4. Uncheck The Show Safe Results Option for Those WebSites Which Are Showing An Error Message.

ESET.

In Eset Security Products You Can Try to Disable and Re-Enable SSL / TLS Protocol Filtering or Generally Disable The Interception of Secure Connections AS Described in Eset's Support Article.

Kaspersky

Affectedsed Users of Kaspersky SHOLD UPGRADE TO THE MOST Recent Version of Their Security Product, As Kaspersky 2019 and Above Contain Mitigations for This Problem. The Kaspersky Downloads Page Includes "Update" Links That Will Install The Latest Version Free of Charge For Users With a Current Subscription.

OtherWise, You Can Also Disable The Interception of Secure Connections:

1. Open The Dashboard of Your Kaspersky Application.
2. Click On Settings on The Bottom-Left.
3. Click ADDITIONAL AND THEN NETWORK.
4. In the Encrypted Connections Scanning SECTION CHECK THE Do Not Scan Encrypted Connections Option and Confirm This Change.
5. Finally, Reboot Your System for the Changes to Take Effect.

FAMILY SAFETY SETTINGS IN Windows Accounts

In Microsoft Windows Accounts Protected by Family Safety Settings, Secure Connections on Popular WebSites Like Google, Facebook and YouTube Might Be Intercepted and Their Certificates Replaced by A Certificate Issued by Microsoft In Order to Filter and Record Search Activity.

Monitoring / Filtering In Corporate Networks

Some Traffic Monitoring / Filtering Products Used in Corporate Environments Might Intercept Encrypted Connections by Replacing a WebSite "S CERTIFICATE WITH THEIR OWN, AT THE SAME TIME POSSIBLY TRIGGERING ERRORS ON SECURE HTTPS-SITES.

If You Suspect This Might Be The Case, Please Contact Your It Department to Ensure The Correct Configuration of Firefox to Enable It Working Properly In Such An Environment, AS The Beplated in the Firefox Trust Store First. More Information for It Departments on How to Go About This Can Be Found In The Mozilla Wiki Page CA: Addroottofirefox.

Malware.

Some Forms of Malware Intercepting Encrypted Web Traffic Can Cause This Error Message - Refer to the Article Troubleshoot Firefox Issues Caused by Malware On How to Deal With Malware Problems.

The Error Occurs on One Particular Site ONLY

In Case You Get this Problem on One Particular Site Only, This Type of Error Generally Indicates That The Web Server Is Not Configured Properly. However, If You See This Error on a Legitimate Major WebSite Like Google or Facebook or Sites Where Financial Transactions Take Place, You Should Continue with the.

Certificate Issued by A Authority Belonging to Symantec

After A Number of Irregularities with Certificates Issued by Symantec root Authorities Came to Light, Browser Vendors Including Mozilla Are Gradually Removing Trust from these Certificates in their Products. Firefox Will No Longer Trust Server Certificates Issued by Symantec, Including Those Issued Under The Geotrust, Rapidssl, Thawte and VeriSign Brands. For more information, See This Mozilla Blog Post and This Compatibility Document.

Mozilla_PKIX_ERROR_ADDITIONAL_POLICY_CONSTRAINT_FAILED WILL BE THE PRIMARY ERROR BUT WILL BE THE ERROR CODE SEC_UNROR_UNKNOWN_ISSUER INSTEAD. In Any Case, If You Come Across Such A Site You Should Contact The Owner of the Website to Inform Them of the Problem.

Mozilla Strongly Encourages Operators of Affected Sites to Take Immediate Action to Replace These Certificates. DigiCert Is Providing

U to about in about d with t in about p o l b about in a t e l i

This section

Reluction of secure connections in

Mozilla Firefox Browser does not use Microsoft Windows Certificate Storage. To check SSL connections
when using Firefox, you must install the Kaspersky Lab certificate manually.

You can also use the certificate installation wizard if the browser is not running.

To manually install the Kaspersky Lab certificate, follow these steps:

Instruments Setting.

Additionally.

3. In block Certificates Select Bookmark Safety and click on the button View

certificates.

CENTERS CERTIFICATION and click on the button Restore.

certificate

"Laboratories

Kaspersky ":

.

View.

To manually install the Kaspersky Lab certificate for Mozilla Firefox version 3.x,

follow these steps:

1. In the browser menu, select Instruments Setting.

2. In the window that opens, select the section Additionally.

3. On the tab Encryption Click on the button View certificates.

4. In the window that opens, select Bookmark CENTERS CERTIFICATION and click on the button Import.

5. In the window that opens, select the Kaspersky Lab certificate file. The path to the file

certificate

"Laboratories

Kaspersky ":

% ALLUSERSPROFILE% \\ Application Data \\ Kaspersky Lab \\ AVP11 \\ DATA \\ CERT \\ (Fake) Kaspersky Anti-
Virus Personal Root Certificate.cer.

6. In the window that opens, select the checkboxes to select actions to check which will

certificate installed. To view the certificate information, click on the button.
View.

If your computer is running the Microsoft Windows Vista or Microsoft operating system
Windows

certificate

"Laboratories

Kaspersky "

next:

% ALLUSERSPROFILE% \\ Kaspersky Lab \\ Avp11 \\ Data \\ Cert \\ (Fake) Kaspersky Anti-Virus Personal Root Certificate.cer.