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Port 4849 (appserv-https)

IANA assigns port 4849 to appserv-https: App Server - Admin HTTPS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
appserv-https TCP App Server - Admin HTTPS Sreeram Duvvuru -
appserv-https UDP App Server - Admin HTTPS Sreeram Duvvuru -

Registry dates for this port: registered 2002-04.

Check what is listening on port 4849

Linux: is anything listening on TCP 4849?
sudo ss -tlnp 'sport = :4849'
Linux: UDP 4849
sudo ss -ulnp 'sport = :4849'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4849
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4849 '
Windows (Command Prompt)
netstat -ano | findstr :4849
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4849 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4849
From Windows
Test-NetConnection HOST -Port 4849
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4849

Block port 4849 in the firewall

ufw
sudo ufw deny 4849/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4849 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4849 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4849' -Direction Inbound -Protocol TCP -LocalPort 4849 -Action Block
ufw
sudo ufw deny 4849/udp
iptables
sudo iptables -A INPUT -p udp --dport 4849 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4849 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4849' -Direction Inbound -Protocol UDP -LocalPort 4849 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.