I'm using R6400v2 and have been for several years. I run a web server on port 80 and 443, and allow ssh to my server from certain IP ranges. Port forwarding has been in place for years and has worked perfectly.
I recently had a power surge and had to replace a network switch, but the router appeared unaffected.
Except: ports 22, 80 and 443 no longer reach the correct server. Ports 80 and 443 appear to be connecting to the router itself, at least from the HTML returned, and port 22 is ignored completely. Ssh from a machine outside the network just sits and waits, eventually timing out.
The Advanced Admin -> Advanced Setup -> Web Services Management no longer has a flag to control outside admin access to the router, just the following:
