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The An error has been found in the VPN server certificate:Certificate received is signed by an untrusted certificate authority error message appears while the WebVPN connects with to CVPN 3000 Concentrator
Microsoft Windows does not consider CVPN 3000 Concentrator as a trusted site, because you receive the error message in pop-up window.
Note: This pop-up window does not have any impact on WebVPN functionality.
In order to get rid of this error message, buy an SSL certificate from a trusted site.You can also install the SSL certificate of the concentrator as a trusted site but you have to do this in every computer that establishes a connection.
Once you get the error, choose Yes and another window appears with the Certificate information. Choose Details and then choose Copy to File. Select the option Based-64 encoded and then name the file Cisco and save it into your Desktop.
Once the certificate is in your desktop, open Microsoft Internet Explorer, choose Tools > Internet Options > Content > Certificates > Trusted Root CertificationAuthorities and choose Import. Import the certificate file that it is in your desktop. After this, the error disappears.