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Port 488 (gss-http)

IANA assigns port 488 to gss-http.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
gss-http TCP gss-http Doug Rosenthal -
gss-http UDP gss-http Doug Rosenthal -

Check what is listening on port 488

Linux: is anything listening on TCP 488?
sudo ss -tlnp 'sport = :488'
Linux: UDP 488
sudo ss -ulnp 'sport = :488'
Linux / macOS: which process owns the port
sudo lsof -nP -i :488
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':488 '
Windows (Command Prompt)
netstat -ano | findstr :488
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 488 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 488
From Windows
Test-NetConnection HOST -Port 488
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 488

Block port 488 in the firewall

ufw
sudo ufw deny 488/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 488 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 488 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 488' -Direction Inbound -Protocol TCP -LocalPort 488 -Action Block
ufw
sudo ufw deny 488/udp
iptables
sudo iptables -A INPUT -p udp --dport 488 -j DROP
nftables
sudo nft add rule inet filter input udp dport 488 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 488' -Direction Inbound -Protocol UDP -LocalPort 488 -Action Block

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