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Port 2070 (ah-esp-encap)

IANA assigns port 2070 to ah-esp-encap: AH and ESP Encapsulated in UDP packet.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ah-esp-encap TCP AH and ESP Encapsulated in UDP packet Amy Weaver -
ah-esp-encap UDP AH and ESP Encapsulated in UDP packet Amy Weaver -

Check what is listening on port 2070

Linux: is anything listening on TCP 2070?
sudo ss -tlnp 'sport = :2070'
Linux: UDP 2070
sudo ss -ulnp 'sport = :2070'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2070
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2070 '
Windows (Command Prompt)
netstat -ano | findstr :2070
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2070 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2070
From Windows
Test-NetConnection HOST -Port 2070
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2070

Block port 2070 in the firewall

ufw
sudo ufw deny 2070/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2070 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2070 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2070' -Direction Inbound -Protocol TCP -LocalPort 2070 -Action Block
ufw
sudo ufw deny 2070/udp
iptables
sudo iptables -A INPUT -p udp --dport 2070 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2070 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2070' -Direction Inbound -Protocol UDP -LocalPort 2070 -Action Block

Related ports

2068avauthsrvprtcl2069event-port2071acp-port2072msync

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