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Port 3101 (hp-pxpib)

IANA assigns port 3101 to hp-pxpib: HP PolicyXpert PIB Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
hp-pxpib TCP HP PolicyXpert PIB Server Brian O Keefe -
hp-pxpib UDP HP PolicyXpert PIB Server Brian O Keefe -

Check what is listening on port 3101

Linux: is anything listening on TCP 3101?
sudo ss -tlnp 'sport = :3101'
Linux: UDP 3101
sudo ss -ulnp 'sport = :3101'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3101
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3101 '
Windows (Command Prompt)
netstat -ano | findstr :3101
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3101 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3101
From Windows
Test-NetConnection HOST -Port 3101
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3101

Block port 3101 in the firewall

ufw
sudo ufw deny 3101/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3101 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3101 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3101' -Direction Inbound -Protocol TCP -LocalPort 3101 -Action Block
ufw
sudo ufw deny 3101/udp
iptables
sudo iptables -A INPUT -p udp --dport 3101 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3101 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3101' -Direction Inbound -Protocol UDP -LocalPort 3101 -Action Block

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