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// Other services

Port 2537: Upgrade Protocol

Port 2537 is assigned by IANA to upgrade (Upgrade Protocol).

2537

How upgrade works

Other services
client:2537upgraderesponse client:2537upgraderesponse

The client sends a request to port 2537 and the upgrade 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 2537 dangerous?

We have no specific security note for port 2537. 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 2537

ServicePortTransportDescriptionReferenceUpdated
upgrade 2537 TCP, UDP Upgrade Protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 2537, and is it reachable?

Linux

sudo ss -ltnup 'sport = :2537'      # process listening on 2537
sudo lsof -nP -i :2537

macOS

sudo lsof -nP -i :2537

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2537 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 2537
netstat -ano | findstr :2537

From another machine

nmap -p 2537 -sV <host>
sudo nmap -sU -p 2537 <host>
nc -zv <host> 2537

Block it in the firewall

sudo ufw deny 2537/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 2537" -Direction Inbound -LocalPort 2537 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 2537 used for?

Port 2537 is assigned by IANA to upgrade (Upgrade Protocol).

Is port 2537 TCP or UDP?

Port 2537 is registered for TCP and UDP.

Is it safe to open port 2537?

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 2537 is open?

On Linux run "ss -ltnup 'sport = :2537'", on macOS "lsof -nP -i :2537", and on Windows "netstat -ano | findstr :2537" to see the local process. From another machine, "nmap -p 2537 <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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