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Port 6936 (xsmsvc)

IANA assigns port 6936 to xsmsvc: XenSource Management Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
xsmsvc TCP XenSource Management Service Roger Klorese -
xsmsvc UDP XenSource Management Service Roger Klorese -

Registry dates for this port: registered 2006-06.

Check what is listening on port 6936

Linux: is anything listening on TCP 6936?
sudo ss -tlnp 'sport = :6936'
Linux: UDP 6936
sudo ss -ulnp 'sport = :6936'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6936
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6936 '
Windows (Command Prompt)
netstat -ano | findstr :6936
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6936 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6936
From Windows
Test-NetConnection HOST -Port 6936
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6936

Block port 6936 in the firewall

ufw
sudo ufw deny 6936/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6936 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6936 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6936' -Direction Inbound -Protocol TCP -LocalPort 6936 -Action Block
ufw
sudo ufw deny 6936/udp
iptables
sudo iptables -A INPUT -p udp --dport 6936 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6936 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6936' -Direction Inbound -Protocol UDP -LocalPort 6936 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.