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Local dataset, no network
// Other services

Port 2977: TTCs Enterprise Test Access Protocol - NS

Port 2977 is assigned by IANA to ttc-etap-ns (TTCs Enterprise Test Access Protocol - NS).

2977

How ttc-etap-ns works

Other services
client:2977ttc-etap-nsresponse client:2977ttc-etap-nsresponse

The client sends a request to port 2977 and the ttc-etap-ns 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 2977 dangerous?

We have no specific security note for port 2977. 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 2977

ServicePortTransportDescriptionReferenceUpdated
ttc-etap-ns 2977 TCP, UDP TTCs Enterprise Test Access Protocol - NS - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2977, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2977'      # process listening on 2977
sudo lsof -nP -i :2977

macOS

sudo lsof -nP -i :2977

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2977 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2977
netstat -ano | findstr :2977

From another machine

nmap -p 2977 -sV <host>
sudo nmap -sU -p 2977 <host>
nc -zv <host> 2977

Block it in the firewall

sudo ufw deny 2977/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2977" -Direction Inbound -LocalPort 2977 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2977 used for?

Port 2977 is assigned by IANA to ttc-etap-ns (TTCs Enterprise Test Access Protocol - NS).

Is port 2977 TCP or UDP?

Port 2977 is registered for TCP and UDP.

Is it safe to open port 2977?

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 2977 is open?

On Linux run "ss -ltnup 'sport = :2977'", on macOS "lsof -nP -i :2977", and on Windows "netstat -ano | findstr :2977" to see the local process. From another machine, "nmap -p 2977 <host>" shows whether it is reachable.

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