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Port 5722 (msdfsr)

IANA assigns port 5722 to msdfsr: Microsoft DFS Replication Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
msdfsr TCP Microsoft DFS Replication Service Guhan Suriyanarayana -
msdfsr UDP Microsoft DFS Replication Service Guhan Suriyanarayana -

Registry dates for this port: registered 2006-03.

Check what is listening on port 5722

Linux: is anything listening on TCP 5722?
sudo ss -tlnp 'sport = :5722'
Linux: UDP 5722
sudo ss -ulnp 'sport = :5722'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5722
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5722 '
Windows (Command Prompt)
netstat -ano | findstr :5722
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5722 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5722
From Windows
Test-NetConnection HOST -Port 5722
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5722

Block port 5722 in the firewall

ufw
sudo ufw deny 5722/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5722 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5722 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5722' -Direction Inbound -Protocol TCP -LocalPort 5722 -Action Block
ufw
sudo ufw deny 5722/udp
iptables
sudo iptables -A INPUT -p udp --dport 5722 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5722 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5722' -Direction Inbound -Protocol UDP -LocalPort 5722 -Action Block

Related ports

5720ms-licensing5721dtpt5723omhs5724omsdk

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