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Port 74 (netrjs-4)

IANA assigns port 74 to netrjs-4: Remote Job Service.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netrjs-4 TCP Remote Job Service Bob Braden -
netrjs-4 UDP Remote Job Service Bob Braden -

Check what is listening on port 74

Linux: is anything listening on TCP 74?
sudo ss -tlnp 'sport = :74'
Linux: UDP 74
sudo ss -ulnp 'sport = :74'
Linux / macOS: which process owns the port
sudo lsof -nP -i :74
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':74 '
Windows (Command Prompt)
netstat -ano | findstr :74
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 74 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 74
From Windows
Test-NetConnection HOST -Port 74
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 74

Block port 74 in the firewall

ufw
sudo ufw deny 74/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 74 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 74 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 74' -Direction Inbound -Protocol TCP -LocalPort 74 -Action Block
ufw
sudo ufw deny 74/udp
iptables
sudo iptables -A INPUT -p udp --dport 74 -j DROP
nftables
sudo nft add rule inet filter input udp dport 74 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 74' -Direction Inbound -Protocol UDP -LocalPort 74 -Action Block

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72netrjs-273netrjs-375any private dial out service76deos

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