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// Other services

Port 616: SCO System Administration Server

Port 616 is assigned by IANA to sco-sysmgr (SCO System Administration Server).

616

How sco-sysmgr works

Other services
client:616sco-sysmgrresponse client:616sco-sysmgrresponse

The client sends a request to port 616 and the sco-sysmgr 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 616 dangerous?

We have no specific security note for port 616. 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 616

ServicePortTransportDescriptionReferenceUpdated
sco-sysmgr 616 TCP, UDP SCO System Administration Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 616, and is it reachable?

Linux

sudo ss -ltnup 'sport = :616'      # process listening on 616
sudo lsof -nP -i :616

macOS

sudo lsof -nP -i :616

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 616 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 616
netstat -ano | findstr :616

From another machine

nmap -p 616 -sV <host>
sudo nmap -sU -p 616 <host>
nc -zv <host> 616

Block it in the firewall

sudo ufw deny 616/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 616" -Direction Inbound -LocalPort 616 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 616 used for?

Port 616 is assigned by IANA to sco-sysmgr (SCO System Administration Server).

Is port 616 TCP or UDP?

Port 616 is registered for TCP and UDP.

Is it safe to open port 616?

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 616 is open?

On Linux run "ss -ltnup 'sport = :616'", on macOS "lsof -nP -i :616", and on Windows "netstat -ano | findstr :616" to see the local process. From another machine, "nmap -p 616 <host>" shows whether it is reachable.

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