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// Databases & caches

Port 5677: Quest Central DB2 Launchr

Port 5677 is assigned by IANA to questdb2-lnchr (Quest Central DB2 Launchr).

5677

How questdb2-lnchr works

Databases & caches
app:5677questdb2-lnchr app:5677questdb2-lnchr

The application sends a SQL query to the questdb2-lnchr server on port 5677, which returns rows from its tables.

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
Databases & caches
01 Security

Is port 5677 dangerous?

We have no specific security note for port 5677. Its risk depends on the program actually listening on it. General advice for databases & caches services:

  • Bind the service to localhost or a private network, never to a public address.
  • Enable authentication, use per-application accounts and require TLS.
  • Watch for exposed Docker ports: publish them on 127.0.0.1 only.
02 Registry

IANA registry entries for port 5677

ServicePortTransportDescriptionReferenceUpdated
questdb2-lnchr 5677 TCP, UDP Quest Central DB2 Launchr - 2002-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 5677, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5677'      # process listening on 5677
sudo lsof -nP -i :5677

macOS

sudo lsof -nP -i :5677

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5677 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5677
netstat -ano | findstr :5677

From another machine

nmap -p 5677 -sV <host>
sudo nmap -sU -p 5677 <host>
nc -zv <host> 5677

Block it in the firewall

sudo ufw deny 5677/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5677" -Direction Inbound -LocalPort 5677 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5677 used for?

Port 5677 is assigned by IANA to questdb2-lnchr (Quest Central DB2 Launchr).

Is port 5677 TCP or UDP?

Port 5677 is registered for TCP and UDP.

Is it safe to open port 5677?

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. Bind the service to localhost or a private network, never to a public address.

How do I check if port 5677 is open?

On Linux run "ss -ltnup 'sport = :5677'", on macOS "lsof -nP -i :5677", and on Windows "netstat -ano | findstr :5677" to see the local process. From another machine, "nmap -p 5677 <host>" shows whether it is reachable.

05 Related
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