I tried to login to my vpn concentrator today and got "page could not be displayed" The url is https://a.b.c.d/admin and I get prompted with the certificate window and when I click yes it goes to " page could not be displayed " I have tried so many times and no luck. I can ping a.b.c.d - has anyone experienced this before ? BTW, my VPN users can connect fine except that I could not login to make changes. I will appreciate any help. Thanks.