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Port 2261 (comotionmaster)

IANA assigns port 2261 to comotionmaster: CoMotion Master Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
comotionmaster TCP CoMotion Master Server - -
comotionmaster UDP CoMotion Master Server - -

Check what is listening on port 2261

Linux: is anything listening on TCP 2261?
sudo ss -tlnp 'sport = :2261'
Linux: UDP 2261
sudo ss -ulnp 'sport = :2261'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2261
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2261 '
Windows (Command Prompt)
netstat -ano | findstr :2261
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2261 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2261
From Windows
Test-NetConnection HOST -Port 2261
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2261

Block port 2261 in the firewall

ufw
sudo ufw deny 2261/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2261 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2261 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2261' -Direction Inbound -Protocol TCP -LocalPort 2261 -Action Block
ufw
sudo ufw deny 2261/udp
iptables
sudo iptables -A INPUT -p udp --dport 2261 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2261 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2261' -Direction Inbound -Protocol UDP -LocalPort 2261 -Action Block

Related ports

2259bid-serv2260apc-22602262comotionback2263ecwcfg

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