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Port 372 (ulistproc)

IANA assigns port 372 to ulistproc: ListProcessor.

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

IANA assignment

Service nameProtoDescriptionAssigneeReference
ulistproc TCP ListProcessor Anastasios Kotsikona -
ulistproc UDP ListProcessor Anastasios Kotsikona -

Check what is listening on port 372

Linux: is anything listening on TCP 372?
sudo ss -tlnp 'sport = :372'
Linux: UDP 372
sudo ss -ulnp 'sport = :372'
Linux / macOS: which process owns the port
sudo lsof -nP -i :372
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':372 '
Windows (Command Prompt)
netstat -ano | findstr :372
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 372 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 372
From Windows
Test-NetConnection HOST -Port 372
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 372

Block port 372 in the firewall

ufw
sudo ufw deny 372/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 372 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 372 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 372' -Direction Inbound -Protocol TCP -LocalPort 372 -Action Block
ufw
sudo ufw deny 372/udp
iptables
sudo iptables -A INPUT -p udp --dport 372 -j DROP
nftables
sudo nft add rule inet filter input udp dport 372 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 372' -Direction Inbound -Protocol UDP -LocalPort 372 -Action Block

Related ports

370codaauth2371clearcase373legent-1374legent-2

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