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Port 6963 (swismgr1)

IANA assigns port 6963 to swismgr1.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
swismgr1 TCP swismgr1 Yutaka Ono -
swismgr1 UDP swismgr1 Yutaka Ono -

Check what is listening on port 6963

Linux: is anything listening on TCP 6963?
sudo ss -tlnp 'sport = :6963'
Linux: UDP 6963
sudo ss -ulnp 'sport = :6963'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6963
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6963 '
Windows (Command Prompt)
netstat -ano | findstr :6963
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6963 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6963
From Windows
Test-NetConnection HOST -Port 6963
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6963

Block port 6963 in the firewall

ufw
sudo ufw deny 6963/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6963 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6963 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6963' -Direction Inbound -Protocol TCP -LocalPort 6963 -Action Block
ufw
sudo ufw deny 6963/udp
iptables
sudo iptables -A INPUT -p udp --dport 6963 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6963 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6963' -Direction Inbound -Protocol UDP -LocalPort 6963 -Action Block

Related ports

6961jmact36962jmevt26964swismgr26965swistrap

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