Brother MFC-9120CN - Manual (Page 119)

Firewall settings (For Network users)
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l Click New Rule.
m Choose Port and click Next.
n To add port enter the information below:
 For network scanning
Choose UDP and enter “54925” in the Specific remote ports:.
Click Next.
 For Network PC-Fax
Choose UDP and enter “54926” in the Specific remote ports:.
Click Next.