CyberHunter
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// Monitoring & logging

Port 1634: Log On America Probe

Port 1634 is assigned by IANA to loaprobe (Log On America Probe).

1634

How loaprobe works

Monitoring & logging
monitoringdeviceloaprobe monitoringdeviceloaprobe

The monitoring server collects metrics, alerts or logs from devices over port 1634.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Monitoring & logging
01 Security

Is port 1634 dangerous?

We have no specific security note for port 1634. Its risk depends on the program actually listening on it. General advice for monitoring & logging services:

  • Restrict management and monitoring protocols to the monitoring network.
  • Replace community strings and default credentials.
  • Send logs over TLS.
02 Registry

IANA registry entries for port 1634

ServicePortTransportDescriptionReferenceUpdated
loaprobe 1634 TCP, UDP Log On America Probe - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1634, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1634'      # process listening on 1634
sudo lsof -nP -i :1634

macOS

sudo lsof -nP -i :1634

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1634 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1634
netstat -ano | findstr :1634

From another machine

nmap -p 1634 -sV <host>
sudo nmap -sU -p 1634 <host>
nc -zv <host> 1634

Block it in the firewall

sudo ufw deny 1634/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1634" -Direction Inbound -LocalPort 1634 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1634 used for?

Port 1634 is assigned by IANA to loaprobe (Log On America Probe).

Is port 1634 TCP or UDP?

Port 1634 is registered for TCP and UDP.

Is it safe to open port 1634?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Restrict management and monitoring protocols to the monitoring network.

How do I check if port 1634 is open?

On Linux run "ss -ltnup 'sport = :1634'", on macOS "lsof -nP -i :1634", and on Windows "netstat -ano | findstr :1634" to see the local process. From another machine, "nmap -p 1634 <host>" shows whether it is reachable.

05 Related
:161 SNMP udp · tcp · high risk :162 SNMP trap udp · tcp · moderate risk :9090 Prometheus / admin consoles tcp · udp · high risk :514 Syslog udp · tcp · moderate risk :6514 Syslog over TLS tcp · udp · dccp · low risk :5601 Kibana tcp · udp · high risk :391 SynOptics SNMP Relay Port tcp · udp :412 Trap Convention Port tcp · udp

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