HTTPfy

Port 8280 (synapse-nhttp)

IANA assigns port 8280 to synapse-nhttp: Synapse Non Blocking HTTP.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
synapse-nhttp TCP Synapse Non Blocking HTTP Ruwan Linton -
synapse-nhttp UDP Synapse Non Blocking HTTP Ruwan Linton -

Registry dates for this port: registered 2008-06-05.

Check what is listening on port 8280

Linux: is anything listening on TCP 8280?
sudo ss -tlnp 'sport = :8280'
Linux: UDP 8280
sudo ss -ulnp 'sport = :8280'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8280
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8280 '
Windows (Command Prompt)
netstat -ano | findstr :8280
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8280 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8280
From Windows
Test-NetConnection HOST -Port 8280
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8280

Block port 8280 in the firewall

ufw
sudo ufw deny 8280/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8280 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8280 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8280' -Direction Inbound -Protocol TCP -LocalPort 8280 -Action Block
ufw
sudo ufw deny 8280/udp
iptables
sudo iptables -A INPUT -p udp --dport 8280 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8280 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8280' -Direction Inbound -Protocol UDP -LocalPort 8280 -Action Block

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