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// Other services

Port 1774: global-dtserv

Port 1774 is assigned by IANA to global-dtserv (global-dtserv).

1774

How global-dtserv works

Other services
client:1774global-dtservresponse client:1774global-dtservresponse

The client sends a request to port 1774 and the global-dtserv 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
Other services
01 Security

Is port 1774 dangerous?

We have no specific security note for port 1774. 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 1774

ServicePortTransportDescriptionReferenceUpdated
global-dtserv 1774 TCP, UDP global-dtserv - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1774, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1774'      # process listening on 1774
sudo lsof -nP -i :1774

macOS

sudo lsof -nP -i :1774

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1774 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1774
netstat -ano | findstr :1774

From another machine

nmap -p 1774 -sV <host>
sudo nmap -sU -p 1774 <host>
nc -zv <host> 1774

Block it in the firewall

sudo ufw deny 1774/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1774" -Direction Inbound -LocalPort 1774 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1774 used for?

Port 1774 is assigned by IANA to global-dtserv (global-dtserv).

Is port 1774 TCP or UDP?

Port 1774 is registered for TCP and UDP.

Is it safe to open port 1774?

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 1774 is open?

On Linux run "ss -ltnup 'sport = :1774'", on macOS "lsof -nP -i :1774", and on Windows "netstat -ano | findstr :1774" to see the local process. From another machine, "nmap -p 1774 <host>" shows whether it is reachable.

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