View the process occupying port 445 and its pid.

Then kill -9 $pid (here changed to the process pid number occupying port 445)

You can also disable port 445 using your own iptables.

Iptables-ainput-ptcp-dport445-jdrop discards all packets in the incoming direction of port 445.

Iptables-a output-p TCP-dport 445-j drop discards all packets in the outgoing direction on port 445.