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Port 4850 (sun-as-nodeagt)

IANA assigns port 4850 to sun-as-nodeagt: Sun App Server - NA.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sun-as-nodeagt TCP Sun App Server - NA Kedar Mhaswade -
sun-as-nodeagt UDP Sun App Server - NA Kedar Mhaswade -

Registry dates for this port: registered 2004-11.

Check what is listening on port 4850

Linux: is anything listening on TCP 4850?
sudo ss -tlnp 'sport = :4850'
Linux: UDP 4850
sudo ss -ulnp 'sport = :4850'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4850
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4850 '
Windows (Command Prompt)
netstat -ano | findstr :4850
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4850 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4850
From Windows
Test-NetConnection HOST -Port 4850
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4850

Block port 4850 in the firewall

ufw
sudo ufw deny 4850/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4850 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4850 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4850' -Direction Inbound -Protocol TCP -LocalPort 4850 -Action Block
ufw
sudo ufw deny 4850/udp
iptables
sudo iptables -A INPUT -p udp --dport 4850 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4850 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4850' -Direction Inbound -Protocol UDP -LocalPort 4850 -Action Block

Related ports

4848GlassFish / Payara admin4849appserv-https4851derby-repli4867unify-debug

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