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Port 8937 (twds)

IANA assigns port 8937 to twds: Transaction Warehouse Data Service.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
twds TCP Transaction Warehouse Data Service Lance M Steenson -

Registry dates for this port: registered 2009-09-18.

Check what is listening on port 8937

Linux: is anything listening on TCP 8937?
sudo ss -tlnp 'sport = :8937'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8937
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8937 '
Windows (Command Prompt)
netstat -ano | findstr :8937
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8937 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8937
From Windows
Test-NetConnection HOST -Port 8937

Block port 8937 in the firewall

ufw
sudo ufw deny 8937/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8937 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8937 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8937' -Direction Inbound -Protocol TCP -LocalPort 8937 -Action Block

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