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Port 2534 (combox-web-acc)

IANA assigns port 2534 to combox-web-acc: Combox Web Access.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
combox-web-acc TCP Combox Web Access Yochai Cohen -
combox-web-acc UDP Combox Web Access Yochai Cohen -

Check what is listening on port 2534

Linux: is anything listening on TCP 2534?
sudo ss -tlnp 'sport = :2534'
Linux: UDP 2534
sudo ss -ulnp 'sport = :2534'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2534
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2534 '
Windows (Command Prompt)
netstat -ano | findstr :2534
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2534 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2534
From Windows
Test-NetConnection HOST -Port 2534
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2534

Block port 2534 in the firewall

ufw
sudo ufw deny 2534/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2534 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2534 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2534' -Direction Inbound -Protocol TCP -LocalPort 2534 -Action Block
ufw
sudo ufw deny 2534/udp
iptables
sudo iptables -A INPUT -p udp --dport 2534 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2534 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2534' -Direction Inbound -Protocol UDP -LocalPort 2534 -Action Block

Related ports

2532ovtopmd2533snifferserver2535madcap2536btpp2audctr1

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