Guests or visitors joining a guest network are not able to browse to HTTPS sites while protected by Web Security Service (WSS).
Guests that are connected to a guest network are receiving browser errors while protected by WSS and attempting to browse to HTTPS sites.
Web Security Service
The machine does not have the Web Security Service Cloud Root Certificate installed in the Trusted Root Certificate Authorities directory.
Note! This will exempt the network from SSL Interception and some WSS features and policy will not apply correctly.
Alternatively, guests can install the Cloud Root Certificate into the Trusted Root Certificate Authorities directory. It is up to the organization to decide the method of downloading and distributing the certificate to the guest users.