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

Sflow not showing any data in added sensor



i installed prtg in ma pc as collector and added my juniper EX8208 switch as sender for sflow. but when i add any sensor for mail or web etc it showed no data yet. i installed wireshark in my pc but it showed sflow data, can you help me for the same ?

prtg sensors sflow

Created on Apr 6, 2013 11:01:03 AM

7 Replies




which sFlow version is the Juniper sending?

PRTG only supports version 5 at the moment.

have you already tried our sFlow tester from our website?


does it show flows?

Created on Apr 8, 2013 5:27:16 AM by  Aurelio Lombardi [Paessler Support]



Juniper sending sflow v5. we tested with sflowtester it show me the results, but when i add any sensor in device it show no data yet.

Created on Apr 8, 2013 6:06:06 AM




please send the sFlow tester output to

[email protected]

make some reference to this KB article.

Created on Apr 8, 2013 7:06:27 AM by  Aurelio Lombardi [Paessler Support]



Hi All did you get a correct answer for this issue? I am facing the same.

Created on Sep 28, 2017 10:45:24 AM



Can you verify that the time settings of both appliances are actually correct?

Kind regards,
Stephan Linke, Tech Support Team

Created on Sep 29, 2017 11:11:07 AM by  Stephan Linke [Paessler Support]



I am facing same issue for HP routers & Switches. While using sflow tester getting error like "socket could not be bound. Address and port are already in use" Kindly suggest on this.

Created on Mar 16, 2018 5:58:08 AM



Hi Rakesh,

If you receive this error message, please see this knowledge base article.

Best regards,

Created on Mar 19, 2018 1:51:34 PM by  Sebastian Kniege [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.