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Port 3157 (lsa-comm)

IANA assigns port 3157 to lsa-comm: LSA Communicator.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
lsa-comm TCP LSA Communicator Brian Carnell -
lsa-comm UDP LSA Communicator Brian Carnell -

Registry dates for this port: last modified 2024-03-18.

Check what is listening on port 3157

Linux: is anything listening on TCP 3157?
sudo ss -tlnp 'sport = :3157'
Linux: UDP 3157
sudo ss -ulnp 'sport = :3157'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3157
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3157 '
Windows (Command Prompt)
netstat -ano | findstr :3157
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3157 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3157
From Windows
Test-NetConnection HOST -Port 3157
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3157

Block port 3157 in the firewall

ufw
sudo ufw deny 3157/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3157 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3157 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3157' -Direction Inbound -Protocol TCP -LocalPort 3157 -Action Block
ufw
sudo ufw deny 3157/udp
iptables
sudo iptables -A INPUT -p udp --dport 3157 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3157 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3157' -Direction Inbound -Protocol UDP -LocalPort 3157 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.