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Port 7707 (sync-em7)

IANA assigns port 7707 to sync-em7: EM7 Dynamic Updates.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sync-em7 TCP EM7 Dynamic Updates Christopher Cordray -
sync-em7 UDP EM7 Dynamic Updates Christopher Cordray -

Registry dates for this port: registered 2004-11.

Check what is listening on port 7707

Linux: is anything listening on TCP 7707?
sudo ss -tlnp 'sport = :7707'
Linux: UDP 7707
sudo ss -ulnp 'sport = :7707'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7707
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7707 '
Windows (Command Prompt)
netstat -ano | findstr :7707
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7707 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7707
From Windows
Test-NetConnection HOST -Port 7707
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 7707

Block port 7707 in the firewall

ufw
sudo ufw deny 7707/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7707 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7707 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7707' -Direction Inbound -Protocol TCP -LocalPort 7707 -Action Block
ufw
sudo ufw deny 7707/udp
iptables
sudo iptables -A INPUT -p udp --dport 7707 -j DROP
nftables
sudo nft add rule inet filter input udp dport 7707 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 7707' -Direction Inbound -Protocol UDP -LocalPort 7707 -Action Block

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