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Port 3441 (connect-client)

IANA assigns port 3441 to connect-client: OC Connect Client.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
connect-client TCP OC Connect Client - -
connect-client UDP OC Connect Client - -

Check what is listening on port 3441

Linux: is anything listening on TCP 3441?
sudo ss -tlnp 'sport = :3441'
Linux: UDP 3441
sudo ss -ulnp 'sport = :3441'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3441
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3441 '
Windows (Command Prompt)
netstat -ano | findstr :3441
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3441 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3441
From Windows
Test-NetConnection HOST -Port 3441
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3441

Block port 3441 in the firewall

ufw
sudo ufw deny 3441/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3441 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3441 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3441' -Direction Inbound -Protocol TCP -LocalPort 3441 -Action Block
ufw
sudo ufw deny 3441/udp
iptables
sudo iptables -A INPUT -p udp --dport 3441 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3441 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3441' -Direction Inbound -Protocol UDP -LocalPort 3441 -Action Block

Related ports

3439hri-port3440ans-console3442connect-server3443ov-nnm-websrv

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