Brother MFC-9120CN - Manual (Page 117)

Firewall settings (For Network users)
109
6
d Click New Rule.
e Choose Port and click Next.
f
To add a port enter the information below:
 For network scanning
Choose UDP and enter “54925” in the Specific local ports:.
Click Next.
 For Network PC-Fax
Choose UDP and enter “54926” in the Specific local ports:.
Click Next.