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Port 8300 (tmi)

IANA assigns port 8300 to tmi: Transport Management Interface.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
tmi TCP Transport Management Interface Steve Kneizys -
tmi UDP Transport Management Interface Steve Kneizys -

Registry dates for this port: registered 2006-11.

Check what is listening on port 8300

Linux: is anything listening on TCP 8300?
sudo ss -tlnp 'sport = :8300'
Linux: UDP 8300
sudo ss -ulnp 'sport = :8300'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8300
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8300 '
Windows (Command Prompt)
netstat -ano | findstr :8300
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8300 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8300
From Windows
Test-NetConnection HOST -Port 8300
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8300

Block port 8300 in the firewall

ufw
sudo ufw deny 8300/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8300 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8300 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8300' -Direction Inbound -Protocol TCP -LocalPort 8300 -Action Block
ufw
sudo ufw deny 8300/udp
iptables
sudo iptables -A INPUT -p udp --dport 8300 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8300 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8300' -Direction Inbound -Protocol UDP -LocalPort 8300 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.