What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general.

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags

Opening Firewall Ports Best Practice



We have typically taken the most restrictive approach with opening ports in our firewall to PRTG. We only allow known IPs of remote probes to connect, but this causes issues with cellular backup or other connections that aren't static.

I can't find a best practice from Paessler on this? Are we correct to restrict access as much as possible or is there little concern in opening 23560 to the world?

firewall ports security

Created on Mar 30, 2018 6:55:07 PM

1 Reply



Hi Schester,

I think a restrictive approach is a good one. You will find a list of all external servers and also ports, PRTG is using in different situations; here:

PRTG Connections to External Servers
PRTG Port Usage

I hope this helps.

Kind regards
Andreas Günther, Technical Support

Created on Apr 2, 2018 11:58:05 AM by  Andreas Günther [Paessler Support]

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.