Brother MFC 9840CDW - Manual (Page 130)

Firewall settings (For Network users)
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7
d
Click the Exceptions tab.
e
Click the Add port... button.
f
To add port 54925 for network scanning, enter the information below:
1 In Name: Enter any description, for example “Brother Scanner”.
2 In Port number: Enter “54925” .
3 Make sure UDP is selected.
Then, click OK.
g
Click the Add port... button.
h
To add port 54926 for Network PC-Fax, enter the information below:
1 In Name: Enter any description, for example “Brother PC-Fax“ .
2 In Port number: Enter “54926”.
3 Make sure UDP is selected.
Then, click OK.