- 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 3737: XPanel Daemon
Port 3737 is assigned by IANA to xpanel (XPanel Daemon).
3737
How xpanel works
Other servicesThe client sends a request to port 3737 and the xpanel 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 3737 dangerous?
We have no specific security note for port 3737. Its risk depends on the program actually listening on it. General advice for other services services:
IANA registry entries for port 3737
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| xpanel | 3737 | TCP | XPanel Daemon | - | 2009-03-04 |
| - | 3737 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 3737, and is it reachable?
Linux
sudo ss -ltnup 'sport = :3737' # process listening on 3737
sudo lsof -nP -i :3737macOS
sudo lsof -nP -i :3737
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3737 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 3737 netstat -ano | findstr :3737
From another machine
nmap -p 3737 -sV <host> nc -zv <host> 3737
Block it in the firewall
sudo ufw deny 3737/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 3737" -Direction Inbound -LocalPort 3737 -Protocol TCP -Action Block # Windows
What is port 3737 used for?
Port 3737 is assigned by IANA to xpanel (XPanel Daemon).
Is port 3737 TCP or UDP?
Port 3737 is registered for TCP.
Is it safe to open port 3737?
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 3737 is open?
On Linux run "ss -ltnup 'sport = :3737'", on macOS "lsof -nP -i :3737", and on Windows "netstat -ano | findstr :3737" to see the local process. From another machine, "nmap -p 3737 <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