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// Other services

Port 1651: shiva_confsrvr

Port 1651 is assigned by IANA to shiva_confsrvr (shiva_confsrvr), shiva-confsrvr (shiva_confsrvr IANA assigned this well-formed service name as a replacement for "shiva_confsrvr".).

1651

How shiva_confsrvr works

Other services
client:1651shiva_confsrvrresponse client:1651shiva_confsrvrresponse

The client sends a request to port 1651 and the shiva_confsrvr service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 1651 dangerous?

We have no specific security note for port 1651. 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 1651

ServicePortTransportDescriptionReferenceUpdated
shiva_confsrvr 1651 TCP, UDP shiva_confsrvr - -
shiva-confsrvr 1651 TCP, UDP shiva_confsrvr IANA assigned this well-formed service name as a replacement for "shiva_confsrvr". - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1651, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1651'      # process listening on 1651
sudo lsof -nP -i :1651

macOS

sudo lsof -nP -i :1651

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1651 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1651
netstat -ano | findstr :1651

From another machine

nmap -p 1651 -sV <host>
sudo nmap -sU -p 1651 <host>
nc -zv <host> 1651

Block it in the firewall

sudo ufw deny 1651/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1651" -Direction Inbound -LocalPort 1651 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1651 used for?

Port 1651 is assigned by IANA to shiva_confsrvr (shiva_confsrvr), shiva-confsrvr (shiva_confsrvr IANA assigned this well-formed service name as a replacement for "shiva_confsrvr".).

Is port 1651 TCP or UDP?

Port 1651 is registered for TCP and UDP.

Is it safe to open port 1651?

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 1651 is open?

On Linux run "ss -ltnup 'sport = :1651'", on macOS "lsof -nP -i :1651", and on Windows "netstat -ano | findstr :1651" to see the local process. From another machine, "nmap -p 1651 <host>" shows whether it is reachable.

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