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Port 562 (chshell)

IANA assigns port 562 to chshell: chcmd.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
chshell TCP chcmd - -
chshell UDP chcmd - -

Check what is listening on port 562

Linux: is anything listening on TCP 562?
sudo ss -tlnp 'sport = :562'
Linux: UDP 562
sudo ss -ulnp 'sport = :562'
Linux / macOS: which process owns the port
sudo lsof -nP -i :562
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':562 '
Windows (Command Prompt)
netstat -ano | findstr :562
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 562 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 562
From Windows
Test-NetConnection HOST -Port 562
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 562

Block port 562 in the firewall

ufw
sudo ufw deny 562/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 562 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 562 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 562' -Direction Inbound -Protocol TCP -LocalPort 562 -Action Block
ufw
sudo ufw deny 562/udp
iptables
sudo iptables -A INPUT -p udp --dport 562 -j DROP
nftables
sudo nft add rule inet filter input udp dport 562 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 562' -Direction Inbound -Protocol UDP -LocalPort 562 -Action Block

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