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Port 9902 (enrp-sctp-tls)

IANA assigns port 9902 to enrp-sctp-tls: enrp/tls server channel.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
enrp-sctp-tls SCTP enrp/tls server channel - RFC 5353

Check what is listening on port 9902

Linux: is anything listening on TCP 9902?
sudo ss -tlnp 'sport = :9902'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9902
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9902 '
Windows (Command Prompt)
netstat -ano | findstr :9902
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9902 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9902
From Windows
Test-NetConnection HOST -Port 9902

Block port 9902 in the firewall

ufw
sudo ufw deny 9902/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9902 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9902 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9902' -Direction Inbound -Protocol TCP -LocalPort 9902 -Action Block

Related ports

9900iua9901enrp, enrp-sctp9903multicast-ping9909domaintime

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