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Port 450 (tserver)

IANA assigns port 450 to tserver: Computer Supported Telecomunication Applications.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
tserver TCP Computer Supported Telecomunication Applications Harvey S Schultz -
tserver UDP Computer Supported Telecomunication Applications Harvey S Schultz -

Check what is listening on port 450

Linux: is anything listening on TCP 450?
sudo ss -tlnp 'sport = :450'
Linux: UDP 450
sudo ss -ulnp 'sport = :450'
Linux / macOS: which process owns the port
sudo lsof -nP -i :450
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':450 '
Windows (Command Prompt)
netstat -ano | findstr :450
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 450 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 450
From Windows
Test-NetConnection HOST -Port 450
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 450

Block port 450 in the firewall

ufw
sudo ufw deny 450/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 450 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 450 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 450' -Direction Inbound -Protocol TCP -LocalPort 450 -Action Block
ufw
sudo ufw deny 450/udp
iptables
sudo iptables -A INPUT -p udp --dport 450 -j DROP
nftables
sudo nft add rule inet filter input udp dport 450 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 450' -Direction Inbound -Protocol UDP -LocalPort 450 -Action Block

Related ports

448ddm-ssl449as-servermap451sfs-smp-net452sfs-config

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