HTTPfy

Port 4594 (ias-session)

IANA assigns port 4594 to ias-session: IAS-Session (ANRI-ANRI).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ias-session TCP IAS-Session (ANRI-ANRI) - -
ias-session UDP IAS-Session (ANRI-ANRI) - -

Check what is listening on port 4594

Linux: is anything listening on TCP 4594?
sudo ss -tlnp 'sport = :4594'
Linux: UDP 4594
sudo ss -ulnp 'sport = :4594'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4594
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4594 '
Windows (Command Prompt)
netstat -ano | findstr :4594
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4594 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4594
From Windows
Test-NetConnection HOST -Port 4594
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4594

Block port 4594 in the firewall

ufw
sudo ufw deny 4594/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4594 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4594 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4594' -Direction Inbound -Protocol TCP -LocalPort 4594 -Action Block
ufw
sudo ufw deny 4594/udp
iptables
sudo iptables -A INPUT -p udp --dport 4594 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4594 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4594' -Direction Inbound -Protocol UDP -LocalPort 4594 -Action Block

Related ports

4592hrpd-ith-at-an4593ipt-anri-anri4595ias-paging4596ias-neighbor

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