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// Network services

Port 2291: EPSON Advanced Printer Share Protocol

Port 2291 is assigned by IANA to eapsp (EPSON Advanced Printer Share Protocol).

2291

How eapsp works

Network services
client:2291eapspresponse client:2291eapspresponse

The client sends a request to port 2291 and the eapsp service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Network services
01 Security

Is port 2291 dangerous?

We have no specific security note for port 2291. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 2291

ServicePortTransportDescriptionReferenceUpdated
eapsp 2291 TCP, UDP EPSON Advanced Printer Share Protocol - 2006-06

// source: IANA service name and port number registry

03 Check it

Which program uses port 2291, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2291'      # process listening on 2291
sudo lsof -nP -i :2291

macOS

sudo lsof -nP -i :2291

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2291 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2291
netstat -ano | findstr :2291

From another machine

nmap -p 2291 -sV <host>
sudo nmap -sU -p 2291 <host>
nc -zv <host> 2291

Block it in the firewall

sudo ufw deny 2291/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2291" -Direction Inbound -LocalPort 2291 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2291 used for?

Port 2291 is assigned by IANA to eapsp (EPSON Advanced Printer Share Protocol).

Is port 2291 TCP or UDP?

Port 2291 is registered for TCP and UDP.

Is it safe to open port 2291?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 2291 is open?

On Linux run "ss -ltnup 'sport = :2291'", on macOS "lsof -nP -i :2291", and on Windows "netstat -ano | findstr :2291" to see the local process. From another machine, "nmap -p 2291 <host>" shows whether it is reachable.

05 Related
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk

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