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Port 27442 (jesmsjc)

IANA assigns port 27442 to jesmsjc: Job controller service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
jesmsjc TCP Job controller service Chris Newman -
jesmsjc UDP Job controller service Chris Newman -

Registry dates for this port: registered 2010-10-15.

Check what is listening on port 27442

Linux: is anything listening on TCP 27442?
sudo ss -tlnp 'sport = :27442'
Linux: UDP 27442
sudo ss -ulnp 'sport = :27442'
Linux / macOS: which process owns the port
sudo lsof -nP -i :27442
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':27442 '
Windows (Command Prompt)
netstat -ano | findstr :27442
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 27442 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 27442
From Windows
Test-NetConnection HOST -Port 27442
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 27442

Block port 27442 in the firewall

ufw
sudo ufw deny 27442/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 27442 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 27442 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 27442' -Direction Inbound -Protocol TCP -LocalPort 27442 -Action Block
ufw
sudo ufw deny 27442/udp
iptables
sudo iptables -A INPUT -p udp --dport 27442 -j DROP
nftables
sudo nft add rule inet filter input udp dport 27442 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 27442' -Direction Inbound -Protocol UDP -LocalPort 27442 -Action Block

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