- 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.
Port 6400: Business Objects CMS contact port
Port 6400 is assigned by IANA to boe-cms (Business Objects CMS contact port).
6400
How boe-cms works
Other servicesThe client sends a request to port 6400 and the boe-cms service answers.
- Transport
- None registered
- 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
Is port 6400 dangerous?
We have no specific security note for port 6400. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 6400
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| boe-cms | 6400 | - | Business Objects CMS contact port | - | 2026-05-27 |
// source: IANA service name and port number registry
Which program uses port 6400, and is it reachable?
Linux
sudo ss -ltnup 'sport = :6400' # process listening on 6400
sudo lsof -nP -i :6400macOS
sudo lsof -nP -i :6400
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6400 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 6400 netstat -ano | findstr :6400
From another machine
nmap -p 6400 -sV <host> nc -zv <host> 6400
Block it in the firewall
sudo ufw deny 6400/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 6400" -Direction Inbound -LocalPort 6400 -Protocol TCP -Action Block # Windows
What is port 6400 used for?
Port 6400 is assigned by IANA to boe-cms (Business Objects CMS contact port).
Is port 6400 TCP or UDP?
Port 6400 has no registered transport. Any program can still use it over TCP or UDP.
Is it safe to open port 6400?
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 6400 is open?
On Linux run "ss -ltnup 'sport = :6400'", on macOS "lsof -nP -i :6400", and on Windows "netstat -ano | findstr :6400" to see the local process. From another machine, "nmap -p 6400 <host>" shows whether it is reachable.
Other other services ports
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp