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// Other services

Port 4536: Event Heap Server SSL

Port 4536 is assigned by IANA to ehs-ssl (Event Heap Server SSL).

4536

How ehs-ssl works

Other services
client:4536ehs-sslresponse client:4536ehs-sslresponse

The client sends a request to port 4536 and the ehs-ssl 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 4536 dangerous?

We have no specific security note for port 4536. 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 4536

ServicePortTransportDescriptionReferenceUpdated
ehs-ssl 4536 TCP, UDP Event Heap Server SSL - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 4536, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4536'      # process listening on 4536
sudo lsof -nP -i :4536

macOS

sudo lsof -nP -i :4536

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4536 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4536
netstat -ano | findstr :4536

From another machine

nmap -p 4536 -sV <host>
sudo nmap -sU -p 4536 <host>
nc -zv <host> 4536

Block it in the firewall

sudo ufw deny 4536/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4536" -Direction Inbound -LocalPort 4536 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4536 used for?

Port 4536 is assigned by IANA to ehs-ssl (Event Heap Server SSL).

Is port 4536 TCP or UDP?

Port 4536 is registered for TCP and UDP.

Is it safe to open port 4536?

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 4536 is open?

On Linux run "ss -ltnup 'sport = :4536'", on macOS "lsof -nP -i :4536", and on Windows "netstat -ano | findstr :4536" to see the local process. From another machine, "nmap -p 4536 <host>" shows whether it is reachable.

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