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Port 1391 (iclpv-sas)

IANA assigns port 1391 to iclpv-sas: Storage Access Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
iclpv-sas TCP Storage Access Server - -
iclpv-sas UDP Storage Access Server - -

Check what is listening on port 1391

Linux: is anything listening on TCP 1391?
sudo ss -tlnp 'sport = :1391'
Linux: UDP 1391
sudo ss -ulnp 'sport = :1391'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1391
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1391 '
Windows (Command Prompt)
netstat -ano | findstr :1391
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1391 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1391
From Windows
Test-NetConnection HOST -Port 1391
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1391

Block port 1391 in the firewall

ufw
sudo ufw deny 1391/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1391 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1391 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1391' -Direction Inbound -Protocol TCP -LocalPort 1391 -Action Block
ufw
sudo ufw deny 1391/udp
iptables
sudo iptables -A INPUT -p udp --dport 1391 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1391 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1391' -Direction Inbound -Protocol UDP -LocalPort 1391 -Action Block

Related ports

1389iclpv-dm1390iclpv-sc1392iclpv-pm1393iclpv-nls

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