Port 10000 WEBMIN
Port 10000 is most commonly used by Webmin. The IANA registry lists TCP / UDP for this number.
What is port 10000 used for?
Port 10000 is most commonly used by Webmin. Webmin and similar administration panels commonly listen on port 10000; the IANA registry assigns the number to NDMP. It sits in the registered range, the block used by databases, application servers and developer tooling. Port conflicts here are common when several local services start at once.
Ports are the transport-layer address a service listens on. A client that wants to reach ndmp connects to port 10000. A TCP connection is refused when nothing is listening, while a UDP request simply goes unanswered. That is why a port conflict appears whenever two processes try to bind the same number.
Use the commands below to confirm whether port 10000 is actually in use before you change firewall rules. Blocking the port stops new inbound traffic at the firewall, but it does not stop a local process from listening, and it does not remove the service from the machine.
Browse all Infrastructure and administration ports
Source: IANA Service Name and Transport Protocol Port Number Registry. Registered assignee: [Brian_Ehrmantraut].
Check and block port 10000
Copy-ready commands for the protocols assigned to this port. Run the check first, then block only what should not be reachable.
Check on Linux
sudo ss -tlpn 'sport = :10000'
sudo ss -ulpn 'sport = :10000'Check on Windows
Get-NetTCPConnection -LocalPort 10000 -State Listen -ErrorAction SilentlyContinue
Get-NetUDPEndpoint -LocalPort 10000 -ErrorAction SilentlyContinueBlock with UFW
sudo ufw deny 10000/tcp
sudo ufw deny 10000/udpBlock with iptables
sudo iptables -A INPUT -p tcp --dport 10000 -j DROP
sudo iptables -A INPUT -p udp --dport 10000 -j DROPThese commands are examples for a typical host. Check the listener before you change firewall rules, and persist iptables rules with iptables-save or netfilter-persistent. On Windows, use Windows Defender Firewall or New-NetFirewallRule for persistent blocks. The iptables rules here cover IPv4; mirror them with ip6tables if IPv6 is enabled.
Is port 10000 safe to expose?
Webmin and similar remote administration panels have suffered critical pre-authentication flaws. Keep them on a VPN and patch immediately. Treat this port as sensitive. Restrict it to trusted networks or a VPN, require authentication and logging, and never expose it directly to the public internet without a hardened gateway in front.
Where port 10000 is usually used
Most traffic on port 10000 falls into these scenarios. The demo below is a safe way to confirm the listener before you change anything.
- Service discovery, configuration and secret management for other systems.
- Administration panels used by operators rather than end users.
- Automation that reads or updates control-plane state on port 10000.
Open the admin panel
The TLS handshake reveals the certificate; Webmin installations often use a self-signed one.
openssl s_client -connect 127.0.0.1:10000Common problems with port 10000
Connection refused or timed out
Refused usually means the host is reachable but nothing is listening on port 10000. A timeout more often means a firewall drop, a wrong host or a service bound to a different interface.
Port already in use
Find the process holding the port with sudo ss -tlpn 'sport = :10000' or sudo lsof -i :10000. Stop that process or configure it to bind another port; killing it without identifying it can take down a production service.
Firewall rule did not survive a reboot
UFW and Windows Firewall keep rules across restarts. Raw iptables rules do not: save them with iptables-save or the netfilter-persistent package, and re-apply after upgrades that reset the ruleset.
The port is blocked but still reachable
A firewall rule filters inbound traffic; it does not close the listener. Confirm with the check command above and bind the service to 127.0.0.1 when only local clients need it.
Port 10000 at a glance
| Port number | 10000 |
|---|---|
| IANA service name | ndmp |
| Commonly used by | Webmin |
| Transport protocol | TCP / UDP |
| Category | Infrastructure and administration |
| Range | Registered port (1024–10000) |
| Risk level | High |
| Registered assignee | [Brian_Ehrmantraut] |
| Registry description | Network Data Management Protocol |
| Source | IANA Service Name and Transport Protocol Port Number Registry |
Frequently asked questions
What is port 10000 used for?
Port 10000 (WEBMIN). The IANA registry lists TCP / UDP for this number. Webmin and similar administration panels commonly listen on port 10000; the IANA registry assigns the number to NDMP.
How do I check if port 10000 is open?
On Linux run `sudo ss -tlpn 'sport = :10000'` and `sudo ss -ulpn 'sport = :10000'`. On Windows run `Get-NetTCPConnection -LocalPort 10000 -State Listen -ErrorAction SilentlyContinue` and `Get-NetUDPEndpoint -LocalPort 10000 -ErrorAction SilentlyContinue` in PowerShell. If the port is open, the output shows a process listening on port 10000; empty output usually means nothing is bound to it.
How do I block port 10000?
With UFW run `sudo ufw deny 10000/tcp` and `sudo ufw deny 10000/udp`. With iptables run `sudo iptables -A INPUT -p tcp --dport 10000 -j DROP` and `sudo iptables -A INPUT -p udp --dport 10000 -j DROP`. Persist the iptables rules with your distribution's netfilter-persistent or iptables-save tooling so they survive a reboot.
Is port 10000 safe to expose?
Webmin and similar remote administration panels have suffered critical pre-authentication flaws. Keep them on a VPN and patch immediately. Nevertheless, treat this port as sensitive. Restrict it to trusted networks or a VPN, require authentication and logging, and never expose it directly to the public internet without a hardened gateway in front.
Related ports
Primary data: IANA Service Name and Transport Protocol Port Number Registry.
Last reviewed 2026-10-30 · Methodology · About · Privacy