I'm not sure if this is right, but try looking in /etc/wfe/conf and look in a file called itf.conf - look for the interfaces and look to see what "status = " lines look like. Mine are all up, and are status = 1 so if yours are status = 0 then change them to 1 and save the file. IIRC, the system will bring the interfaces up automatically, as it will think you have changed it in in the web front end.
I'm not sure if this is right, but try looking in /etc/wfe/conf and look in a file called itf.conf - look for the interfaces and look to see what "status = " lines look like. Mine are all up, and are status = 1 so if yours are status = 0 then change them to 1 and save the file. IIRC, the system will bring the interfaces up automatically, as it will think you have changed it in in the web front end.