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// Directory & authentication

Port 7004: AFS/Kerberos authentication service

Port 7004 is assigned by IANA to afs3-kaserver (AFS/Kerberos authentication service).

7004

How afs3-kaserver works

Directory & authentication
userdirectoryafs3-kaserverresponse userdirectoryafs3-kaserverresponse

The client proves who it is on port 7004 and gets an answer (or a ticket) it can use with other services.

Transport
TCP · 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
Directory & authentication
01 Security

Is port 7004 dangerous?

We have no specific security note for port 7004. Its risk depends on the program actually listening on it. General advice for directory & authentication services:

  • Keep directory and authentication services on internal networks.
  • Require signing or TLS and disable anonymous queries.
  • Monitor authentication failures for spraying and brute force.
02 Registry

IANA registry entries for port 7004

ServicePortTransportDescriptionReferenceUpdated
afs3-kaserver 7004 TCP, UDP AFS/Kerberos authentication service - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 7004, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7004'      # process listening on 7004
sudo lsof -nP -i :7004

macOS

sudo lsof -nP -i :7004

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7004 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7004
netstat -ano | findstr :7004

From another machine

nmap -p 7004 -sV <host>
sudo nmap -sU -p 7004 <host>
nc -zv <host> 7004

Block it in the firewall

sudo ufw deny 7004/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7004" -Direction Inbound -LocalPort 7004 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7004 used for?

Port 7004 is assigned by IANA to afs3-kaserver (AFS/Kerberos authentication service).

Is port 7004 TCP or UDP?

Port 7004 is registered for TCP and UDP.

Is it safe to open port 7004?

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. Keep directory and authentication services on internal networks.

How do I check if port 7004 is open?

On Linux run "ss -ltnup 'sport = :7004'", on macOS "lsof -nP -i :7004", and on Windows "netstat -ano | findstr :7004" to see the local process. From another machine, "nmap -p 7004 <host>" shows whether it is reachable.

05 Related
:389 LDAP tcp · udp · high risk :636 LDAPS tcp · udp · moderate risk :88 Kerberos tcp · udp · high risk :3268 Global Catalog (LDAP) tcp · udp · high risk :1812 RADIUS udp · tcp · moderate risk :31 MSG Authentication tcp · udp :49 Login Host Protocol (TACACS) tcp · udp :56 XNS Authentication tcp · udp

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