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Port 2734 (ccs-software)

IANA assigns port 2734 to ccs-software: CCS Software.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ccs-software TCP CCS Software Bertus Jacobs -
ccs-software UDP CCS Software Bertus Jacobs -

Check what is listening on port 2734

Linux: is anything listening on TCP 2734?
sudo ss -tlnp 'sport = :2734'
Linux: UDP 2734
sudo ss -ulnp 'sport = :2734'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2734
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2734 '
Windows (Command Prompt)
netstat -ano | findstr :2734
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2734 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2734
From Windows
Test-NetConnection HOST -Port 2734
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2734

Block port 2734 in the firewall

ufw
sudo ufw deny 2734/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2734 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2734 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2734' -Direction Inbound -Protocol TCP -LocalPort 2734 -Action Block
ufw
sudo ufw deny 2734/udp
iptables
sudo iptables -A INPUT -p udp --dport 2734 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2734 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2734' -Direction Inbound -Protocol UDP -LocalPort 2734 -Action Block

Related ports

2732g5m2733signet-ctf2735netiq-mc2736radwiz-nms-srv

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