Port 5601 KIBANA
Port 5601 is most commonly used by Kibana. The IANA registry lists TCP / UDP for this number.
What is port 5601 used for?
Port 5601 is most commonly used by Kibana. Kibana serves its web interface on port 5601 by default; the IANA registry assigns the number to esmagent. 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 esmagent connects to port 5601. 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 5601 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.
Source: IANA Service Name and Transport Protocol Port Number Registry. Registered assignee: [Kimberly_Gibbs].
Check and block port 5601
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 = :5601'
sudo ss -ulpn 'sport = :5601'Check on Windows
Get-NetTCPConnection -LocalPort 5601 -State Listen -ErrorAction SilentlyContinue
Get-NetUDPEndpoint -LocalPort 5601 -ErrorAction SilentlyContinueBlock with UFW
sudo ufw deny 5601/tcp
sudo ufw deny 5601/udpBlock with iptables
sudo iptables -A INPUT -p tcp --dport 5601 -j DROP
sudo iptables -A INPUT -p udp --dport 5601 -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 5601 safe to expose?
Kibana provides read access to indexed data and admin features. Put it behind authentication and a private network. Expose this port only when the service is actually needed. Keep it patched, prefer an encrypted alternative, and limit source addresses with a firewall allowlist.
Where port 5601 is usually used
Most traffic on port 5601 falls into these scenarios. The demo below is a safe way to confirm the listener before you change anything.
- Application search queries, dashboards and indexing pipelines.
- Operators checking cluster health and shard status through the HTTP API.
- Log analytics and full-text search across application data.
Check the Kibana UI
Ask for response headers to confirm the web interface is answering.
curl -I http://127.0.0.1:5601Common problems with port 5601
Connection refused or timed out
Refused usually means the host is reachable but nothing is listening on port 5601. 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 = :5601' or sudo lsof -i :5601. 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 5601 at a glance
| Port number | 5601 |
|---|---|
| IANA service name | esmagent |
| Commonly used by | Kibana |
| Transport protocol | TCP / UDP |
| Category | Search and analytics |
| Range | Registered port (1024–10000) |
| Risk level | Medium |
| Registered assignee | [Kimberly_Gibbs] |
| Registry description | Enterprise Security Agent |
| Source | IANA Service Name and Transport Protocol Port Number Registry |
Frequently asked questions
What is port 5601 used for?
Port 5601 (KIBANA). The IANA registry lists TCP / UDP for this number. Kibana serves its web interface on port 5601 by default; the IANA registry assigns the number to esmagent.
How do I check if port 5601 is open?
On Linux run `sudo ss -tlpn 'sport = :5601'` and `sudo ss -ulpn 'sport = :5601'`. On Windows run `Get-NetTCPConnection -LocalPort 5601 -State Listen -ErrorAction SilentlyContinue` and `Get-NetUDPEndpoint -LocalPort 5601 -ErrorAction SilentlyContinue` in PowerShell. If the port is open, the output shows a process listening on port 5601; empty output usually means nothing is bound to it.
How do I block port 5601?
With UFW run `sudo ufw deny 5601/tcp` and `sudo ufw deny 5601/udp`. With iptables run `sudo iptables -A INPUT -p tcp --dport 5601 -j DROP` and `sudo iptables -A INPUT -p udp --dport 5601 -j DROP`. Persist the iptables rules with your distribution's netfilter-persistent or iptables-save tooling so they survive a reboot.
Is port 5601 safe to expose?
Kibana provides read access to indexed data and admin features. Put it behind authentication and a private network. Nevertheless, expose this port only when the service is actually needed. Keep it patched, prefer an encrypted alternative, and limit source addresses with a firewall allowlist.
Related ports
- Port 5600 · esmmanagerEnterprise Security Manager
- Port 5618 · efrFiscal Registering Protocol
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- Port 9300 · vraceVirtual Racing Service
- Port 5599 · esinstallEnterprise Security Remote Install
- Port 5627 · ninafNode Initiated Network Association Forma
Primary data: IANA Service Name and Transport Protocol Port Number Registry.
Last reviewed 2026-10-30 · Methodology · About · Privacy