CyberHunter
Local dataset, no network
// Other services

Port 2037: APplus Application Server

Port 2037 is assigned by IANA to applus (APplus Application Server).

2037

How applus works

Other services
client:2037applusresponse client:2037applusresponse

The client sends a request to port 2037 and the applus service answers.

Transport
TCP · UDP
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
01 Security

Is port 2037 dangerous?

We have no specific security note for port 2037. Its risk depends on the program actually listening on it. General advice for other services services:

  • 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.
02 Registry

IANA registry entries for port 2037

ServicePortTransportDescriptionReferenceUpdated
applus 2037 TCP, UDP APplus Application Server
Reported: Unauthorized Use Known on port 2037
 - 2021-07-20

// source: IANA service name and port number registry

03 Check it

Which program uses port 2037, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2037'      # process listening on 2037
sudo lsof -nP -i :2037

macOS

sudo lsof -nP -i :2037

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2037 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2037
netstat -ano | findstr :2037

From another machine

nmap -p 2037 -sV <host>
sudo nmap -sU -p 2037 <host>
nc -zv <host> 2037

Block it in the firewall

sudo ufw deny 2037/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2037" -Direction Inbound -LocalPort 2037 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2037 used for?

Port 2037 is assigned by IANA to applus (APplus Application Server).

Is port 2037 TCP or UDP?

Port 2037 is registered for TCP and UDP.

Is it safe to open port 2037?

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 2037 is open?

On Linux run "ss -ltnup 'sport = :2037'", on macOS "lsof -nP -i :2037", and on Windows "netstat -ano | findstr :2037" to see the local process. From another machine, "nmap -p 2037 <host>" shows whether it is reachable.

05 Related
: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

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