HTTPfy

Port 2939 (sm-pas-2)

IANA assigns port 2939 to sm-pas-2: SM-PAS-2.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sm-pas-2 TCP SM-PAS-2 - -
sm-pas-2 UDP SM-PAS-2 - -

Check what is listening on port 2939

Linux: is anything listening on TCP 2939?
sudo ss -tlnp 'sport = :2939'
Linux: UDP 2939
sudo ss -ulnp 'sport = :2939'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2939
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2939 '
Windows (Command Prompt)
netstat -ano | findstr :2939
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2939 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2939
From Windows
Test-NetConnection HOST -Port 2939
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2939

Block port 2939 in the firewall

ufw
sudo ufw deny 2939/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2939 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2939 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2939' -Direction Inbound -Protocol TCP -LocalPort 2939 -Action Block
ufw
sudo ufw deny 2939/udp
iptables
sudo iptables -A INPUT -p udp --dport 2939 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2939 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2939' -Direction Inbound -Protocol UDP -LocalPort 2939 -Action Block

Related ports

2937pnaconsult-lm2938sm-pas-12940sm-pas-32941sm-pas-4

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