Port Forwarding and possible Router Firewall issue

Context: So basically I have a smb server running on port 451 which the default is 445, which the external port is set to the default.

Issue: Everytime I try to send any data to port 445 from the public address it drops the packet; I even checked using a socket server and it will not even see the request come in. I require port 445 as the software which is going to be sending data doesn't have a way to change ports and only goes to port 445.