- Restrict management and monitoring protocols to the monitoring network.
- Replace community strings and default credentials.
- Send logs over TLS.
Port 601: Reliable Syslog Service
Port 601 is assigned by IANA to syslog-conn (Reliable Syslog Service).
601
How syslog-conn works
Monitoring & loggingThe monitoring server collects metrics, alerts or logs from devices over port 601.
- Transport
- TCP · UDP
- Exposure risk
- not rated depends on the program listening
- Encryption
- Unknownnot stated by the registry
- IANA status
- Assigned1 registered service
- Range
- Well-known (0-1023)
- Category
- Monitoring & logging
Is port 601 dangerous?
We have no specific security note for port 601. Its risk depends on the program actually listening on it. General advice for monitoring & logging services:
IANA registry entries for port 601
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| syslog-conn | 601 | TCP, UDP | Reliable Syslog Service | RFC 3195 | - |
// source: IANA service name and port number registry
Which program uses port 601, and is it reachable?
Linux
sudo ss -ltnup 'sport = :601' # process listening on 601
sudo lsof -nP -i :601macOS
sudo lsof -nP -i :601
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 601 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 601 netstat -ano | findstr :601
From another machine
nmap -p 601 -sV <host> sudo nmap -sU -p 601 <host> nc -zv <host> 601
Block it in the firewall
sudo ufw deny 601/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 601" -Direction Inbound -LocalPort 601 -Protocol TCP -Action Block # Windows
What is port 601 used for?
Port 601 is assigned by IANA to syslog-conn (Reliable Syslog Service).
Is port 601 TCP or UDP?
Port 601 is registered for TCP and UDP.
Is it safe to open port 601?
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 601 is open?
On Linux run "ss -ltnup 'sport = :601'", on macOS "lsof -nP -i :601", and on Windows "netstat -ano | findstr :601" to see the local process. From another machine, "nmap -p 601 <host>" shows whether it is reachable.
Other monitoring & logging ports
: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