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Port 9993 (palace-2)

IANA assigns port 9993 to palace-2: OnLive-2.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
palace-2 TCP OnLive-2 Douglas Crockford -
palace-2 UDP OnLive-2 Douglas Crockford -

Check what is listening on port 9993

Linux: is anything listening on TCP 9993?
sudo ss -tlnp 'sport = :9993'
Linux: UDP 9993
sudo ss -ulnp 'sport = :9993'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9993
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9993 '
Windows (Command Prompt)
netstat -ano | findstr :9993
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9993 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9993
From Windows
Test-NetConnection HOST -Port 9993
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9993

Block port 9993 in the firewall

ufw
sudo ufw deny 9993/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9993 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9993 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9993' -Direction Inbound -Protocol TCP -LocalPort 9993 -Action Block
ufw
sudo ufw deny 9993/udp
iptables
sudo iptables -A INPUT -p udp --dport 9993 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9993 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9993' -Direction Inbound -Protocol UDP -LocalPort 9993 -Action Block

Related ports

9991osm-oev9992palace-19994palace-39995palace-4

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