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Port 3577 (config-port)

IANA assigns port 3577 to config-port: Configuration Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
config-port TCP Configuration Port - -
config-port UDP Configuration Port - -

Check what is listening on port 3577

Linux: is anything listening on TCP 3577?
sudo ss -tlnp 'sport = :3577'
Linux: UDP 3577
sudo ss -ulnp 'sport = :3577'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3577
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3577 '
Windows (Command Prompt)
netstat -ano | findstr :3577
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3577 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3577
From Windows
Test-NetConnection HOST -Port 3577
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3577

Block port 3577 in the firewall

ufw
sudo ufw deny 3577/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3577 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3577 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3577' -Direction Inbound -Protocol TCP -LocalPort 3577 -Action Block
ufw
sudo ufw deny 3577/udp
iptables
sudo iptables -A INPUT -p udp --dport 3577 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3577 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3577' -Direction Inbound -Protocol UDP -LocalPort 3577 -Action Block

Related ports

3575ccm-port3576cmc-port3578data-port3579ttat3lb

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