Recently I implemented a Netgear Prosecure firewall. Now I'm having problems with website SSL certificates. For example, when i'm out of the company and try to connect to OWA, wich has a certificate installed that worked fine before, I get the screen that says that this website isn't trusted. When I click continue anyway, the addressbar is red. When I click 'view certificate' it says that it is issued by NetGear. When I try to reach OWA from inside the network, everything works fine including the certificate. The certificate is then issued bij Thawte, as it should be. From inside the company, a lot of HTTPS website do not work properly. I get a certificate error everytime. So it´s the same issue outbound as wel as inbound.
In the firewall I enabled port 443. What can still cause this problem??