Xerox 3550 manual Ports, Port 25, SMTP, Port 53, DNS

XEROX WorkCentre 3550 Information Assurance Disclosure Paper

device-initiated operations (like scanning) cannot assume the existence of the tunnel unless a print job (or other client initiated action) has been previously run since the last boot at either end of the connection.

2.8.2. Ports

The following table summarizes all potential open ports and subsequent sections discuss each port in more detail.

Default	Type	Service name
Port #
25	TCP	SMTP
53	UDP	DNS
68	UDP	BOOTP/DHCP
80	TCP	HTTP
88	UDP/TCP	Kerberos
137	UDP	NETBIOS- Name Service
138	UDP	NETBIOS-Datagram Service; SMB filing and Scan template retrieval
139	TCP	NETBIOS; SMB filing and Scan template retrieval
161	UDP	SNMP
162	UDP	SNMP trap
389	UDP	LDAP
396	TCP	Netware
427	TCP/UDP	SLP
443	TCP	SSL
515	TCP	LPR
546	UDP	DHCPv6
631	TCP	IPP
636	TCP	sLDAP
1124	TCP/UDP	Network Scan Utility
1900	UDP	SSDP
3003	TCP	HTTP/SNMP reply
5200	TCP	UPnP
5353	UDP	Multicast DNS
6000	UDP	SetIP Utility
7000	UDP	LTP Utility
9100	TCP	Raw IP
9400	TCP	TWAIN for Network Utility
9401	TCP	TWAIN for Network Utility

Table 76 Network Ports

Please note that there is no FTP port in this list. FTP is only used to export scanned images and to retrieve Scan Job Templates, and will open port 21 on the remote device. An FTP port is never open on the controller itself.

2.8.2.1.Port 25, SMTP

This unidirectional port is open only when Scan to E-mail or Internet Fax (I-Fax) is exporting images to an SMTP server, or when email alerts are being transmitted. SMTP messages & images are transmitted to the SMTP server from the device.

2.8.2.2.Port 53, DNS

Designating a DNS server will allow the device to resolve domain names. This can be configured via the Local UI or WebUI.

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