Understanding ports and protocols

MVE uses different ports and protocols for several types of network communication, as shown in the following diagram:

Notes:

The ports are bidirectional and must be open or active for MVE to function properly. Make sure that all the printer ports are enabled.
Some communications require an ephemeral port, which is an allocated range of available ports on the server. When a client requests a temporary communication session, the server assigns a dynamic port to the client. The port is valid only for a short duration and can become available for reuse when the previous session expires.

Ports and protocols used during communication from the MVE server to network printers
Protocol	MVE server	Printer	Used for
Network Printing Alliance Protocol (NPAP)	UDP 9187	UDP 9300	Communicating with Lexmark network printers.
XML Network Transport (XMLNT)	UDP 9187	UDP 6000	Communicating with some Lexmark network printers.
Lexmark Secure Transport (LST)	UDP 6100 Ephemeral Transmission Control Protocol (TCP) port (handshaking)	UDP 6100 TCP 6110 (handshaking)	Communicating securely with some Lexmark network printers.
Multicast Domain Name System (mDNS)	Ephemeral User Datagram Protocol (UDP) port	UDP 5353	Discovering Lexmark network printers and determining the security capabilities of printers. Note: This port is required to allow MVE to communicate with secured printers.
Simple Network Management Protocol (SNMP)	Ephemeral UDP port	UDP 161	Discovering and communicating with Lexmark and third-party network printers.
File Transfer Protocol (FTP)	Ephemeral TCP port	TCP 21 TCP 20	Deploying files.
Hypertext Transfer Protocol (HTTP)	Ephemeral TCP port	TCP 80	Deploying files or enforcing configurations.
Hypertext Transfer Protocol (HTTP)	Ephemeral TCP port	TCP 443	Deploying files or enforcing configurations.
Hypertext Transfer Protocol over SSL (HTTPS)	Ephemeral TCP port	TCP 161 TCP 443	Deploying files or enforcing configurations.
RAW	Ephemeral TCP port	TCP 9100	Deploying files or enforcing configurations.

Port and protocol used during communication from network printers to the MVE server
Protocol	Printer	MVE server	Used for
NPAP	UDP 9300	UDP 9187	Generating and receiving alerts

Ports used during communication from the MVE server to databases
MVE server	Database	Used for
Ephemeral TCP port	User‑defined port. The default port is TCP 1433.	Communicating with an SQL Server database.
Ephemeral TCP port	TCP 3050	Communicating with a Firebird database.

Port and protocol used during communication from the browser client to the MVE server
Protocol	Browser Client	MVE server
Hypertext Transfer Protocol over SSL (HTTPs)	TCP port	TCP 443

Port and protocol used during communication from the MVE server to a mail server
Protocol	MVE server	SMTP server	Used for
Simple Mail Transfer Protocol (SMTP)	Ephemeral TCP port	User‑defined port. The default port is TCP 25.	Providing the e‑mail functionality used to receive alerts from printers.

Ports and protocols used during communication from the MVE server to an LDAP server involving user groups and authentication functionality
Protocol	MVE server	LDAP server	Used for
Lightweight Directory Access Protocol (LDAP)	Ephemeral TCP port	User‑defined port. The default port is TCP 389.	Authenticating MVE users using an LDAP server.
Lightweight Directory Access Protocol over TLS (LDAPS)	Ephemeral TCP port	User‑defined port. The default port is TCP 636.	Authenticating MVE users using an LDAP server over TLS.
Kerberos	Ephemeral UDP port	User‑defined port. The default port is UDP 88.	Authenticating MVE users using Kerberos.

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