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// Remote access

Port 4980: Citrix Virtual Path

Port 4980 is assigned by IANA to ctxs-vpp (Citrix Virtual Path).

4980

How ctxs-vpp works

Remote access
terminal:4980ctxs-vpp terminal:4980ctxs-vpp

The client opens a session to port 4980: each command typed is sent to the server, which runs it and returns the output.

Transport
UDP
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
Remote access
01 Security

Is port 4980 dangerous?

We have no specific security note for port 4980. Its risk depends on the program actually listening on it. General advice for remote access services:

  • Do not expose remote administration directly: use a VPN or a zero-trust access proxy.
  • Require MFA or key-based authentication and lock out brute-force attempts.
  • Log every login and alert on new source addresses.
02 Registry

IANA registry entries for port 4980

ServicePortTransportDescriptionReferenceUpdated
ctxs-vpp 4980 UDP Citrix Virtual Path - 2015-04-17
-4980-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4980, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4980'      # process listening on 4980
sudo lsof -nP -i :4980

macOS

sudo lsof -nP -i :4980

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4980 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4980
netstat -ano | findstr :4980

From another machine

nmap -p 4980 -sV <host>
sudo nmap -sU -p 4980 <host>
nc -zv <host> 4980

Block it in the firewall

sudo ufw deny 4980/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4980" -Direction Inbound -LocalPort 4980 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 4980 used for?

Port 4980 is assigned by IANA to ctxs-vpp (Citrix Virtual Path).

Is port 4980 TCP or UDP?

Port 4980 is registered for UDP.

Is it safe to open port 4980?

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. Do not expose remote administration directly: use a VPN or a zero-trust access proxy.

How do I check if port 4980 is open?

On Linux run "ss -ltnup 'sport = :4980'", on macOS "lsof -nP -i :4980", and on Windows "netstat -ano | findstr :4980" to see the local process. From another machine, "nmap -p 4980 <host>" shows whether it is reachable.

05 Related
:22 SSH tcp · udp · sctp · moderate risk :3389 RDP tcp · udp · critical risk :23 Telnet tcp · udp · critical risk :5900 VNC tcp · udp · critical risk :5985 WinRM (HTTP) tcp · udp · high risk :5986 WinRM (HTTPS) tcp · udp · high risk :10000 Webmin tcp · udp · high risk :89 SU/MIT Telnet Gateway tcp · udp

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