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 Content sensor error



I have a health check used by my loadbalancers that I'd like to track in PRTG.

the health check is a simple IIS website. The one thing I find wierd is that the file that is loaded is a .exe. for example the url is Http:server/perfagent.exe if you browse to the site it simply displays an integer from 1-100.

In my sensor I get this error: Last Message Request returned not enough values. (0/1) (code: PE174)

If I configure 'Write sensor result to disk' the sensor's logfile shows the number (and only the number) which sounds like it's working.

can anyone help?

-exe html-content pe174

Created on May 7, 2013 8:10:15 PM

1 Reply

Accepted Answer



Please note that the value(s) must be contained in brackets [] in the http result, everything else is ignored.

Sample result:



Description: Script gives back current status of disk free (%) and CPU usage (%).




Please see the manual page:


Created on May 8, 2013 11:20:20 AM by  Dirk Paessler [Founder Paessler AG] (11,025) 3 6

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.