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// Other services

Port 5637: Symantec CSSC

Port 5637 is assigned by IANA to cssc (Symantec CSSC).

5637

How cssc works

Other services
client:5637csscresponse client:5637csscresponse

The client sends a request to port 5637 and the cssc service answers.

Transport
TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 5637 dangerous?

We have no specific security note for port 5637. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 5637

ServicePortTransportDescriptionReferenceUpdated
cssc 5637 TCP Symantec CSSC - 2011-02-02
-5637-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5637, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5637'      # process listening on 5637
sudo lsof -nP -i :5637

macOS

sudo lsof -nP -i :5637

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5637 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5637
netstat -ano | findstr :5637

From another machine

nmap -p 5637 -sV <host>
nc -zv <host> 5637

Block it in the firewall

sudo ufw deny 5637/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5637" -Direction Inbound -LocalPort 5637 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5637 used for?

Port 5637 is assigned by IANA to cssc (Symantec CSSC).

Is port 5637 TCP or UDP?

Port 5637 is registered for TCP.

Is it safe to open port 5637?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 5637 is open?

On Linux run "ss -ltnup 'sport = :5637'", on macOS "lsof -nP -i :5637", and on Windows "netstat -ano | findstr :5637" to see the local process. From another machine, "nmap -p 5637 <host>" shows whether it is reachable.

05 Related
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