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Port 115 (sftp)

IANA assigns port 115 to sftp: Simple File Transfer Protocol.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sftp TCP Simple File Transfer Protocol Mark Lottor -
sftp UDP Simple File Transfer Protocol Mark Lottor -

Check what is listening on port 115

Linux: is anything listening on TCP 115?
sudo ss -tlnp 'sport = :115'
Linux: UDP 115
sudo ss -ulnp 'sport = :115'
Linux / macOS: which process owns the port
sudo lsof -nP -i :115
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':115 '
Windows (Command Prompt)
netstat -ano | findstr :115
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 115 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 115
From Windows
Test-NetConnection HOST -Port 115
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 115

Block port 115 in the firewall

ufw
sudo ufw deny 115/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 115 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 115 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 115' -Direction Inbound -Protocol TCP -LocalPort 115 -Action Block
ufw
sudo ufw deny 115/udp
iptables
sudo iptables -A INPUT -p udp --dport 115 -j DROP
nftables
sudo nft add rule inet filter input udp dport 115 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 115' -Direction Inbound -Protocol UDP -LocalPort 115 -Action Block

Related ports

112mcidas113Ident116ansanotify117uucp-path

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