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Port 2159 (gdbremote)

IANA assigns port 2159 to gdbremote: GDB Remote Debug Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
gdbremote TCP GDB Remote Debug Port Nigel Stephens -
gdbremote UDP GDB Remote Debug Port Nigel Stephens -

Check what is listening on port 2159

Linux: is anything listening on TCP 2159?
sudo ss -tlnp 'sport = :2159'
Linux: UDP 2159
sudo ss -ulnp 'sport = :2159'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2159
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2159 '
Windows (Command Prompt)
netstat -ano | findstr :2159
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2159 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2159
From Windows
Test-NetConnection HOST -Port 2159
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2159

Block port 2159 in the firewall

ufw
sudo ufw deny 2159/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2159 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2159 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2159' -Direction Inbound -Protocol TCP -LocalPort 2159 -Action Block
ufw
sudo ufw deny 2159/udp
iptables
sudo iptables -A INPUT -p udp --dport 2159 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2159 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2159' -Direction Inbound -Protocol UDP -LocalPort 2159 -Action Block

Related ports

2157xnds2158touchnetplus2160apc-21602161apc-2161

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