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Port 3630 (cs-remote-db)

IANA assigns port 3630 to cs-remote-db: C&S Remote Database Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cs-remote-db TCP C&S Remote Database Port - -
cs-remote-db UDP C&S Remote Database Port - -

Check what is listening on port 3630

Linux: is anything listening on TCP 3630?
sudo ss -tlnp 'sport = :3630'
Linux: UDP 3630
sudo ss -ulnp 'sport = :3630'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3630
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3630 '
Windows (Command Prompt)
netstat -ano | findstr :3630
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3630 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3630
From Windows
Test-NetConnection HOST -Port 3630
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3630

Block port 3630 in the firewall

ufw
sudo ufw deny 3630/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3630 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3630 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3630' -Direction Inbound -Protocol TCP -LocalPort 3630 -Action Block
ufw
sudo ufw deny 3630/udp
iptables
sudo iptables -A INPUT -p udp --dport 3630 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3630 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3630' -Direction Inbound -Protocol UDP -LocalPort 3630 -Action Block

Related ports

3628ept-machine3629escvpnet3631cs-services3632distcc

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