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Port 108 (snagas)

IANA assigns port 108 to snagas: SNA Gateway Access Server.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
snagas TCP SNA Gateway Access Server Kevin Murphy -
snagas UDP SNA Gateway Access Server Kevin Murphy -

Check what is listening on port 108

Linux: is anything listening on TCP 108?
sudo ss -tlnp 'sport = :108'
Linux: UDP 108
sudo ss -ulnp 'sport = :108'
Linux / macOS: which process owns the port
sudo lsof -nP -i :108
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':108 '
Windows (Command Prompt)
netstat -ano | findstr :108
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 108 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 108
From Windows
Test-NetConnection HOST -Port 108
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 108

Block port 108 in the firewall

ufw
sudo ufw deny 108/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 108 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 108 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 108' -Direction Inbound -Protocol TCP -LocalPort 108 -Action Block
ufw
sudo ufw deny 108/udp
iptables
sudo iptables -A INPUT -p udp --dport 108 -j DROP
nftables
sudo nft add rule inet filter input udp dport 108 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 108' -Direction Inbound -Protocol UDP -LocalPort 108 -Action Block

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All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.