VPN ssl security alert

our company switched from using the native windows VPN to Cisco Anyconnect.
the ssl cert that was being used for our old VPN expired and now people are getting regular security alerts.

"Information you exchange with this site cannot be viewed or changed by others. However, there is a problem with the site's security certificate."

Every user i checked with removed the old VPN configuration.

is there something else that needs to be changed?
Dawn Marie StanfordSr. Operations CoordinatorAsked:
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The message is simply warning you that eventho the communication is secured there is a problem with the SSL certificate most likely due to the fact that it's expired.  You should get a new SSL certificate for the VPN server.  Contact the VPN server/router/appliance technical support and they should be able to guide you on how to install a new SSL certificate once you have it.
Prabhin MPEngineer-TechOPSCommented:
Hi ,
This is happening because you are using Self sign certificate in Firewall , moreover you are using FQDN for VPN server which doesn't match with the certificate. Purchase a certificate for your firewall and add import in to firewall to resolve this type of issue.

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Dawn Marie StanfordSr. Operations CoordinatorAuthor Commented:
thank you!
Rob LauzonIT Support ManagerCommented:

The error "Information you exchange with this site cannot be viewed or changed by others. However, there is a problem with the site's security certificate." can be triggered by two different issues.

1. As mentioned above, you are using a self-signed certificate. This is done through default setups of new network nodes and self-signed certificates are not publicly trusted, you would need to either push out the self-signed certificate to all your users or have the user manually trust or download and install the self-signed certificate.


2. You have a digital certificate from a Trusted Certificate Authority (CA) but you have not installed the CA certificates (also known as Chain or Intermediate certificates).

Trusted CA's have what is called Public-Root Certificates, these are pushed out through Root Programs from major software and hardware vendors (e.g. Microsoft, Mozilla, and Apple). The certificate that your users see is the Public-key and is anchored to the root through the CA certificates which creates what is called the Path of Trust. If you install only the Public-key on your server/appliance, your users will receive a Trust Error (like the one you have mentioned.

You can use sites like SSL Labs to test and see the install path is correct - https://www.ssllabs.com/ssltest/. It is also good to see what grade you have. If you have a low grade, you run the risk of opening your network to vulnerabilities which is not good. You should always ensure that the order of ciphers are up to date and the right protocols are enabled.

Let me know if you have any question.
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