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Port 3020 (cifs)

IANA assigns port 3020 to cifs: CIFS.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cifs TCP CIFS Paul Leach -
cifs UDP CIFS Paul Leach -

Check what is listening on port 3020

Linux: is anything listening on TCP 3020?
sudo ss -tlnp 'sport = :3020'
Linux: UDP 3020
sudo ss -ulnp 'sport = :3020'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3020
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3020 '
Windows (Command Prompt)
netstat -ano | findstr :3020
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3020 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3020
From Windows
Test-NetConnection HOST -Port 3020
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3020

Block port 3020 in the firewall

ufw
sudo ufw deny 3020/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3020 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3020 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3020' -Direction Inbound -Protocol TCP -LocalPort 3020 -Action Block
ufw
sudo ufw deny 3020/udp
iptables
sudo iptables -A INPUT -p udp --dport 3020 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3020 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3020' -Direction Inbound -Protocol UDP -LocalPort 3020 -Action Block

Related ports

3018srvc-registry, srvc_registry3019resource-mgr, resource_mgr3021agriserver3022csregagent

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