- 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 9877: The X.510 wrapper protocol
Port 9877 is assigned by IANA to x510 (The X.510 wrapper protocol).
9877
How x510 works
Other servicesThe client sends a request to port 9877 and the x510 service answers.
- Transport
- TCP
- 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 9877 dangerous?
We have no specific security note for port 9877. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 9877
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| x510 | 9877 | TCP | The X.510 wrapper protocol | ITU-T X.510 / ISO/IEC 9584-11 | 2019-09-30 |
| - | 9877 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 9877, and is it reachable?
Linux
sudo ss -ltnup 'sport = :9877' # process listening on 9877
sudo lsof -nP -i :9877macOS
sudo lsof -nP -i :9877
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9877 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 9877 netstat -ano | findstr :9877
From another machine
nmap -p 9877 -sV <host> nc -zv <host> 9877
Block it in the firewall
sudo ufw deny 9877/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 9877" -Direction Inbound -LocalPort 9877 -Protocol TCP -Action Block # Windows
What is port 9877 used for?
Port 9877 is assigned by IANA to x510 (The X.510 wrapper protocol).
Is port 9877 TCP or UDP?
Port 9877 is registered for TCP.
Is it safe to open port 9877?
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 9877 is open?
On Linux run "ss -ltnup 'sport = :9877'", on macOS "lsof -nP -i :9877", and on Windows "netstat -ano | findstr :9877" to see the local process. From another machine, "nmap -p 9877 <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