Port 5637 (cssc)

IANA assigns port 5637 to cssc: Symantec CSSC.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

cssc TCP Symantec CSSC Amol P Tambe -

Registry dates for this port: registered 2011-02-02.

Linux: is anything listening on TCP 5637?

sudo ss -tlnp 'sport = :5637'

Linux / macOS: which process owns the port

sudo lsof -nP -i :5637

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':5637 '

Windows (Command Prompt)

netstat -ano | findstr :5637

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5637 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 5637

From Windows

Test-NetConnection HOST -Port 5637

ufw

sudo ufw deny 5637/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 5637 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 5637 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 5637' -Direction Inbound -Protocol TCP -LocalPort 5637 -Action Block

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