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

Potential error during bandwidth calculation and other changes?




Since updating to version I've seen a few errors pop up in our system which simply says: "potential error during bandwidth check. Loading time 0.1ms"

The sensor is green during most of the day, however I see these errors come and go. I've also noticed that all our ESXi sensors have stopped working (unsupported protocol).

I was hoping someone could point me to a list of security changes for ESXi and whether anyone has seen the bandwidth issue before as well?


bandwidth update upgrade

Created on Mar 8, 2018 2:54:31 AM

4 Replies



Hello there,
thank you for your KB-Post.

The error message you've described is not known to me. Please share screenshots from the Overview and settings of the affected sensor.

As for PRTG's release notes for the new version, they are available here:

Best Regards,
Luciano Lingnau [Paessler Support]

Created on Mar 8, 2018 1:46:06 PM by  Luciano Lingnau [Paessler]




I keep seeing this in the overview section:


Created on Mar 19, 2018 8:58:28 PM



Same issue here! "potential error during bandwidth check. Loading time 0.1ms" HTTP-Sensor. Any solutions?

Created on Mar 20, 2018 9:53:40 AM



Guys, please send us those screenshots as mentioned by Luciano and ideally create a support bundle ("Setup | Contact Support") for further investigation.

Thank you in advance & kind regards,


Created on Mar 20, 2018 12:45:44 PM by  Erhard Mikulik [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.