Port 3970 (lanrevagent)

IANA assigns port 3970 to lanrevagent: LANrev Agent.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

lanrevagent TCP LANrev Agent
Defined TXT keys: txtvers server=<main LANrev server for agent> vers=<version of LANrev Agent> build=<build number of LANrev Agent> id=<agent identifier> Martin Bestmann 3 -

lanrevagent UDP LANrev Agent
Defined TXT keys: txtvers server=<main LANrev server for agent> vers=<version of LANrev Agent> build=<build number of LANrev Agent> id=<agent identifier> Martin Bestmann 3 -

Check what is listening on port 3970

Linux: is anything listening on TCP 3970?

sudo ss -tlnp 'sport = :3970'

Linux: UDP 3970

sudo ss -ulnp 'sport = :3970'

Linux / macOS: which process owns the port

sudo lsof -nP -i :3970

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':3970 '

Windows (Command Prompt)

netstat -ano | findstr :3970

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3970 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine

nc -vz -w 5 HOST 3970

From Windows

Test-NetConnection HOST -Port 3970

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 3970

Block port 3970 in the firewall

ufw

sudo ufw deny 3970/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 3970 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 3970 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 3970' -Direction Inbound -Protocol TCP -LocalPort 3970 -Action Block

ufw

sudo ufw deny 3970/udp