Some VPN configurations require that you accept a server certificate before you can gain access to a protected network resource. A server certificate is essentially a digital signature that verifies the server identity.
If you access a network resource that uses a server certificate, Connect Tunnel may display the certificate. Verify that the server certificate is from a trusted source before accepting it.
As anyone can issue a certificate, you should accept certificates only from trusted sources as the information you receive may be invalid. If you have any concerns about whether or not to accept a certificate, check with your administrator.