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Port 2173 (msfw-replica)

IANA assigns port 2173 to msfw-replica: MS Firewall Replication.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
msfw-replica TCP MS Firewall Replication - -
msfw-replica UDP MS Firewall Replication - -

Check what is listening on port 2173

Linux: is anything listening on TCP 2173?
sudo ss -tlnp 'sport = :2173'
Linux: UDP 2173
sudo ss -ulnp 'sport = :2173'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2173
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2173 '
Windows (Command Prompt)
netstat -ano | findstr :2173
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2173 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2173
From Windows
Test-NetConnection HOST -Port 2173
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2173

Block port 2173 in the firewall

ufw
sudo ufw deny 2173/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2173 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2173 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2173' -Direction Inbound -Protocol TCP -LocalPort 2173 -Action Block
ufw
sudo ufw deny 2173/udp
iptables
sudo iptables -A INPUT -p udp --dport 2173 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2173 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2173' -Direction Inbound -Protocol UDP -LocalPort 2173 -Action Block

Related ports

2171msfw-storage2172msfw-s-storage2174msfw-array2175airsync

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