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Port 2938 (sm-pas-1)

IANA assigns port 2938 to sm-pas-1: SM-PAS-1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sm-pas-1 TCP SM-PAS-1 - -
sm-pas-1 UDP SM-PAS-1 - -

Check what is listening on port 2938

Linux: is anything listening on TCP 2938?
sudo ss -tlnp 'sport = :2938'
Linux: UDP 2938
sudo ss -ulnp 'sport = :2938'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2938
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2938 '
Windows (Command Prompt)
netstat -ano | findstr :2938
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2938 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2938
From Windows
Test-NetConnection HOST -Port 2938
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2938

Block port 2938 in the firewall

ufw
sudo ufw deny 2938/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2938 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2938 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2938' -Direction Inbound -Protocol TCP -LocalPort 2938 -Action Block
ufw
sudo ufw deny 2938/udp
iptables
sudo iptables -A INPUT -p udp --dport 2938 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2938 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2938' -Direction Inbound -Protocol UDP -LocalPort 2938 -Action Block

Related ports

2936otpatch2937pnaconsult-lm2939sm-pas-22940sm-pas-3

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