HTTPfy

Port 4590 (rid)

IANA assigns port 4590 to rid: RID over HTTP/TLS.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
rid TCP RID over HTTP/TLS IESG RFC 6546

Check what is listening on port 4590

Linux: is anything listening on TCP 4590?
sudo ss -tlnp 'sport = :4590'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4590
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4590 '
Windows (Command Prompt)
netstat -ano | findstr :4590
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4590 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4590
From Windows
Test-NetConnection HOST -Port 4590

Block port 4590 in the firewall

ufw
sudo ufw deny 4590/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4590 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4590 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4590' -Direction Inbound -Protocol TCP -LocalPort 4590 -Action Block

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