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Port 4535 (ehs)

IANA assigns port 4535 to ehs: Event Heap Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ehs TCP Event Heap Server - -
ehs UDP Event Heap Server - -

Check what is listening on port 4535

Linux: is anything listening on TCP 4535?
sudo ss -tlnp 'sport = :4535'
Linux: UDP 4535
sudo ss -ulnp 'sport = :4535'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4535
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4535 '
Windows (Command Prompt)
netstat -ano | findstr :4535
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4535 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4535
From Windows
Test-NetConnection HOST -Port 4535
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4535

Block port 4535 in the firewall

ufw
sudo ufw deny 4535/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4535 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4535 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4535' -Direction Inbound -Protocol TCP -LocalPort 4535 -Action Block
ufw
sudo ufw deny 4535/udp
iptables
sudo iptables -A INPUT -p udp --dport 4535 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4535 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4535' -Direction Inbound -Protocol UDP -LocalPort 4535 -Action Block

Related ports

4503m-bus-oms4534armagetronad4536ehs-ssl4537wssauthsvc

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.