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Port 1699 (rsvp-encap-2)

IANA assigns port 1699 to rsvp-encap-2: RSVP-ENCAPSULATION-2.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rsvp-encap-2 TCP RSVP-ENCAPSULATION-2 Bob Braden 2 -
rsvp-encap-2 UDP RSVP-ENCAPSULATION-2 Bob Braden 2 -

Check what is listening on port 1699

Linux: is anything listening on TCP 1699?
sudo ss -tlnp 'sport = :1699'
Linux: UDP 1699
sudo ss -ulnp 'sport = :1699'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1699
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1699 '
Windows (Command Prompt)
netstat -ano | findstr :1699
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1699 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1699
From Windows
Test-NetConnection HOST -Port 1699
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1699

Block port 1699 in the firewall

ufw
sudo ufw deny 1699/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1699 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1699 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1699' -Direction Inbound -Protocol TCP -LocalPort 1699 -Action Block
ufw
sudo ufw deny 1699/udp
iptables
sudo iptables -A INPUT -p udp --dport 1699 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1699 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1699' -Direction Inbound -Protocol UDP -LocalPort 1699 -Action Block

Related ports

1697rrisat1698rsvp-encap-11700mps-raft1701L2TP

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