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

HTTP/1.1 400 Bad Request on sensor for outlook.office.com

Votes:

0

Randomly we are getting false positive failures on our HTTP sensor for outlook.office.com. This started over the weekend and is still going. No changes were made and it was working fine before.

I found the following article: https://kb.paessler.com/en/topic/67398-my-http-sensors-fail-to-monitor-websites-which-use-sni-what-can-i-do I worked through changing the url, creating a new HTTP Advanced sensor, scanning interval, timeout, etc, but nothing is working.

Has anyone seen this with this URL? All of our other website sensors are monitoring without issue.

bad-request http https website

Created on Aug 26, 2019 6:09:49 PM



3 Replies

Votes:

0

Michael,

When this sensor has issues, are you able to get to outlook.office.com from the PRTG server?

Benjamin Day
[Paessler Support]

Created on Aug 26, 2019 6:12:42 PM by Benjamin Day [Paessler Support] (1,441) ●2 ●1



Votes:

0

Yes, we're able to connect to the URL from the PRTG server and from the clients. I tried creating the sensor under a probe server as well, but it still keeps flapping.

FYI that's for the quick reply.

Created on Aug 26, 2019 6:16:54 PM



Votes:

0

What URL are you specifically connecting to? Can you open a support ticket, and send me a screenshot of the error message you are getting?

Benjamin Day
[Paessler Support]

Created on Aug 26, 2019 6:56:34 PM by Benjamin Day [Paessler Support] (1,441) ●2 ●1




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.