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Port 5359 (ms-alerter)

IANA assigns port 5359 to ms-alerter: Microsoft Alerter.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ms-alerter TCP Microsoft Alerter Marc McClure -
ms-alerter UDP Microsoft Alerter Marc McClure -

Registry dates for this port: registered 2007-08-07.

Check what is listening on port 5359

Linux: is anything listening on TCP 5359?
sudo ss -tlnp 'sport = :5359'
Linux: UDP 5359
sudo ss -ulnp 'sport = :5359'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5359
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5359 '
Windows (Command Prompt)
netstat -ano | findstr :5359
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5359 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5359
From Windows
Test-NetConnection HOST -Port 5359
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5359

Block port 5359 in the firewall

ufw
sudo ufw deny 5359/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5359 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5359 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5359' -Direction Inbound -Protocol TCP -LocalPort 5359 -Action Block
ufw
sudo ufw deny 5359/udp
iptables
sudo iptables -A INPUT -p udp --dport 5359 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5359 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5359' -Direction Inbound -Protocol UDP -LocalPort 5359 -Action Block

Related ports

5357wsdapi5358wsdapi-s5360ms-sideshow5361ms-s-sideshow

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