My issue is detailed here but I thought I’d summarize here basically how to get around it.
Turns out this is an issue with the BGW210 and port 443. If I do the same setup but on 8443 or something else, https works fine. Looking further, it turns out this is is a chronic issue with this and possibly other routers supplied by AT&T (see here, here and here). Trying to use IP forwarding or DMZ settings on the router doesn’t save whatever’s behind it from whatever filtering it’s doing. None of the firewall settings work.
Continue reading Fixing Issue With SSL Traffic on AT&T Router