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Port 22343 (cis-secure)

IANA assigns port 22343 to cis-secure: CompactIS Secure Tunnel.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cis-secure TCP CompactIS Secure Tunnel Justin Paupore -
cis-secure UDP CompactIS Secure Tunnel Justin Paupore -

Registry dates for this port: registered 2007-08-16.

Check what is listening on port 22343

Linux: is anything listening on TCP 22343?
sudo ss -tlnp 'sport = :22343'
Linux: UDP 22343
sudo ss -ulnp 'sport = :22343'
Linux / macOS: which process owns the port
sudo lsof -nP -i :22343
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':22343 '
Windows (Command Prompt)
netstat -ano | findstr :22343
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 22343 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 22343
From Windows
Test-NetConnection HOST -Port 22343
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 22343

Block port 22343 in the firewall

ufw
sudo ufw deny 22343/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 22343 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 22343 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 22343' -Direction Inbound -Protocol TCP -LocalPort 22343 -Action Block
ufw
sudo ufw deny 22343/udp
iptables
sudo iptables -A INPUT -p udp --dport 22343 -j DROP
nftables
sudo nft add rule inet filter input udp dport 22343 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 22343' -Direction Inbound -Protocol UDP -LocalPort 22343 -Action Block

Related ports

22333showcockpit-net22335shrewd-control, shrewd-stream22347wibukey22350codemeter

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