Port 363 (rsvp-tunnel, rsvp_tunnel)

IANA assigns port 363 to rsvp-tunnel, rsvp_tunnel: RSVP Tunnel IANA assigned this well-formed service name as a replacement for "rsvp_tunnel"..

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

IANA assignment

Service nameProtoDescriptionAssigneeReference

rsvp-tunnel TCP RSVP Tunnel IANA assigned this well-formed service name as a replacement for "rsvp_tunnel". Andreas Terzis -

rsvp_tunnel TCP RSVP Tunnel
This entry is an alias to "rsvp-tunnel". This entry is now historic, not usable for use with many common service discovery mechanisms. Andreas Terzis -

rsvp-tunnel UDP RSVP Tunnel IANA assigned this well-formed service name as a replacement for "rsvp_tunnel". Andreas Terzis -

rsvp_tunnel UDP RSVP Tunnel
This entry is an alias to "rsvp-tunnel". This entry is now historic, not usable for use with many common service discovery mechanisms. Andreas Terzis -

Check what is listening on port 363

Linux: is anything listening on TCP 363?

sudo ss -tlnp 'sport = :363'

Linux: UDP 363

sudo ss -ulnp 'sport = :363'

Linux / macOS: which process owns the port

sudo lsof -nP -i :363

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':363 '

Windows (Command Prompt)

netstat -ano | findstr :363

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 363 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine

nc -vz -w 5 HOST 363

From Windows

Test-NetConnection HOST -Port 363

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 363

Block port 363 in the firewall

ufw

sudo ufw deny 363/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 363 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 363 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 363' -Direction Inbound -Protocol TCP -LocalPort 363 -Action Block

ufw

sudo ufw deny 363/udp