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Port 5361 (ms-s-sideshow)

IANA assigns port 5361 to ms-s-sideshow: Secure Protocol for Windows SideShow.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ms-s-sideshow TCP Secure Protocol for Windows SideShow Dan Polivy -
ms-s-sideshow UDP Secure Protocol for Windows SideShow Dan Polivy -

Registry dates for this port: registered 2008-03-12.

Check what is listening on port 5361

Linux: is anything listening on TCP 5361?
sudo ss -tlnp 'sport = :5361'
Linux: UDP 5361
sudo ss -ulnp 'sport = :5361'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5361
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5361 '
Windows (Command Prompt)
netstat -ano | findstr :5361
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5361 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5361
From Windows
Test-NetConnection HOST -Port 5361
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5361

Block port 5361 in the firewall

ufw
sudo ufw deny 5361/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5361 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5361 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5361' -Direction Inbound -Protocol TCP -LocalPort 5361 -Action Block
ufw
sudo ufw deny 5361/udp
iptables
sudo iptables -A INPUT -p udp --dport 5361 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5361 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5361' -Direction Inbound -Protocol UDP -LocalPort 5361 -Action Block

Related ports

5359ms-alerter5360ms-sideshow5362serverwsd25363net-projection

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