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// Other services

Port 108: SNA Gateway Access Server

Port 108 is assigned by IANA to snagas (SNA Gateway Access Server).

108

How snagas works

Other services
client:108snagasresponse client:108snagasresponse

The client sends a request to port 108 and the snagas 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 108 dangerous?

We have no specific security note for port 108. 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 108

ServicePortTransportDescriptionReferenceUpdated
snagas 108 TCP, UDP SNA Gateway Access Server - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 108, and is it reachable?

Linux

sudo ss -ltnup 'sport = :108'      # process listening on 108
sudo lsof -nP -i :108

macOS

sudo lsof -nP -i :108

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 108 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 108
netstat -ano | findstr :108

From another machine

nmap -p 108 -sV <host>
sudo nmap -sU -p 108 <host>
nc -zv <host> 108

Block it in the firewall

sudo ufw deny 108/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 108" -Direction Inbound -LocalPort 108 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 108 used for?

Port 108 is assigned by IANA to snagas (SNA Gateway Access Server).

Is port 108 TCP or UDP?

Port 108 is registered for TCP and UDP.

Is it safe to open port 108?

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 108 is open?

On Linux run "ss -ltnup 'sport = :108'", on macOS "lsof -nP -i :108", and on Windows "netstat -ano | findstr :108" to see the local process. From another machine, "nmap -p 108 <host>" shows whether it is reachable.

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