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Port 2266 (mfserver)

IANA assigns port 2266 to mfserver: M-Files Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
mfserver TCP M-Files Server Samppa Lahtinen -
mfserver UDP M-files Server Samppa Lahtinen -

Registry dates for this port: registered 2004-06.

Check what is listening on port 2266

Linux: is anything listening on TCP 2266?
sudo ss -tlnp 'sport = :2266'
Linux: UDP 2266
sudo ss -ulnp 'sport = :2266'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2266
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2266 '
Windows (Command Prompt)
netstat -ano | findstr :2266
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2266 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2266
From Windows
Test-NetConnection HOST -Port 2266
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2266

Block port 2266 in the firewall

ufw
sudo ufw deny 2266/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2266 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2266 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2266' -Direction Inbound -Protocol TCP -LocalPort 2266 -Action Block
ufw
sudo ufw deny 2266/udp
iptables
sudo iptables -A INPUT -p udp --dport 2266 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2266 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2266' -Direction Inbound -Protocol UDP -LocalPort 2266 -Action Block

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