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Port 3117 (mctet-jserv)

IANA assigns port 3117 to mctet-jserv: MCTET Jserv.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mctet-jserv TCP MCTET Jserv Portnoy Boxman -
mctet-jserv UDP MCTET Jserv Portnoy Boxman -

Check what is listening on port 3117

Linux: is anything listening on TCP 3117?
sudo ss -tlnp 'sport = :3117'
Linux: UDP 3117
sudo ss -ulnp 'sport = :3117'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3117
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3117 '
Windows (Command Prompt)
netstat -ano | findstr :3117
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3117 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3117
From Windows
Test-NetConnection HOST -Port 3117
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3117

Block port 3117 in the firewall

ufw
sudo ufw deny 3117/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3117 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3117 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3117' -Direction Inbound -Protocol TCP -LocalPort 3117 -Action Block
ufw
sudo ufw deny 3117/udp
iptables
sudo iptables -A INPUT -p udp --dport 3117 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3117 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3117' -Direction Inbound -Protocol UDP -LocalPort 3117 -Action Block

Related ports

3115mctet-master3116mctet-gateway3118pkagent3119d2000kernel

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