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// Other services

Port 774:

Port 774 is assigned by IANA to acmaint_dbd (), acmaint-dbd (IANA assigned this well-formed service name as a replacement for "acmaint_dbd".), rpasswd ().

774

How acmaint_dbd works

Other services
client:774acmaint_dbdresponse client:774acmaint_dbdresponse

The client sends a request to port 774 and the acmaint_dbd service answers.

Transport
UDP · TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned3 registered services
Range
Well-known (0-1023)
Category
Other services
01 Security

Is port 774 dangerous?

We have no specific security note for port 774. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 774

ServicePortTransportDescriptionReferenceUpdated
acmaint_dbd 774 UDP - -
acmaint-dbd 774 UDP IANA assigned this well-formed service name as a replacement for "acmaint_dbd". - -
rpasswd 774 TCP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 774, and is it reachable?

Linux

sudo ss -ltnup 'sport = :774'      # process listening on 774
sudo lsof -nP -i :774

macOS

sudo lsof -nP -i :774

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 774 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 774
netstat -ano | findstr :774

From another machine

nmap -p 774 -sV <host>
sudo nmap -sU -p 774 <host>
nc -zv <host> 774

Block it in the firewall

sudo ufw deny 774/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 774" -Direction Inbound -LocalPort 774 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 774 used for?

Port 774 is assigned by IANA to acmaint_dbd (), acmaint-dbd (IANA assigned this well-formed service name as a replacement for "acmaint_dbd".), rpasswd ().

Is port 774 TCP or UDP?

Port 774 is registered for UDP and TCP.

Is it safe to open port 774?

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. Close the port if nothing on the host needs it.

How do I check if port 774 is open?

On Linux run "ss -ltnup 'sport = :774'", on macOS "lsof -nP -i :774", and on Windows "netstat -ano | findstr :774" to see the local process. From another machine, "nmap -p 774 <host>" shows whether it is reachable.

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