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Port 7677 (sun-user-https)

IANA assigns port 7677 to sun-user-https: Sun App Server - HTTPS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sun-user-https TCP Sun App Server - HTTPS Abhijit Kumar -
sun-user-https UDP Sun App Server - HTTPS Abhijit Kumar -

Registry dates for this port: registered 2005-11.

Check what is listening on port 7677

Linux: is anything listening on TCP 7677?
sudo ss -tlnp 'sport = :7677'
Linux: UDP 7677
sudo ss -ulnp 'sport = :7677'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7677
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7677 '
Windows (Command Prompt)
netstat -ano | findstr :7677
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7677 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7677
From Windows
Test-NetConnection HOST -Port 7677
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7677

Block port 7677 in the firewall

ufw
sudo ufw deny 7677/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7677 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7677 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7677' -Direction Inbound -Protocol TCP -LocalPort 7677 -Action Block
ufw
sudo ufw deny 7677/udp
iptables
sudo iptables -A INPUT -p udp --dport 7677 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7677 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7677' -Direction Inbound -Protocol UDP -LocalPort 7677 -Action Block

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