- 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 3864: asap-sctp/tls
Port 3864 is assigned by IANA to asap-sctp-tls (asap-sctp/tls), asap-tcp-tls (asap/tls tcp port).
3864
How asap-sctp-tls works
Other servicesThe client sends a request to port 3864 and the asap-sctp-tls service answers.
- Transport
- SCTP · TCP
- 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
Is port 3864 dangerous?
We have no specific security note for port 3864. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 3864
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| asap-sctp-tls | 3864 | SCTP | asap-sctp/tls | RFC 5352 | - |
| asap-tcp-tls | 3864 | TCP | asap/tls tcp port | RFC 5352 | - |
| - | 3864 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 3864, and is it reachable?
Linux
sudo ss -ltnup 'sport = :3864' # process listening on 3864
sudo lsof -nP -i :3864macOS
sudo lsof -nP -i :3864
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3864 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 3864 netstat -ano | findstr :3864
From another machine
nmap -p 3864 -sV <host> nc -zv <host> 3864
Block it in the firewall
sudo ufw deny 3864/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 3864" -Direction Inbound -LocalPort 3864 -Protocol TCP -Action Block # Windows
What is port 3864 used for?
Port 3864 is assigned by IANA to asap-sctp-tls (asap-sctp/tls), asap-tcp-tls (asap/tls tcp port).
Is port 3864 TCP or UDP?
Port 3864 is registered for SCTP and TCP.
Is it safe to open port 3864?
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 3864 is open?
On Linux run "ss -ltnup 'sport = :3864'", on macOS "lsof -nP -i :3864", and on Windows "netstat -ano | findstr :3864" to see the local process. From another machine, "nmap -p 3864 <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