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Port 4401 (ds-srvr)

IANA assigns port 4401 to ds-srvr: ASIGRA Televaulting DS-System Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ds-srvr TCP ASIGRA Televaulting DS-System Service - -
ds-srvr UDP ASIGRA Televaulting DS-System Service - -

Check what is listening on port 4401

Linux: is anything listening on TCP 4401?
sudo ss -tlnp 'sport = :4401'
Linux: UDP 4401
sudo ss -ulnp 'sport = :4401'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4401
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4401 '
Windows (Command Prompt)
netstat -ano | findstr :4401
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4401 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4401
From Windows
Test-NetConnection HOST -Port 4401
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4401

Block port 4401 in the firewall

ufw
sudo ufw deny 4401/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4401 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4401 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4401' -Direction Inbound -Protocol TCP -LocalPort 4401 -Action Block
ufw
sudo ufw deny 4401/udp
iptables
sudo iptables -A INPUT -p udp --dport 4401 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4401 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4401' -Direction Inbound -Protocol UDP -LocalPort 4401 -Action Block

Related ports

4396fly4400ds-srv4402ds-clnt4403ds-user

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