Hi,

I created a custom DNS sensor for SRV Queries. I tried my query in PS and it worked, but when I put it in PRTG I have error about structural error in XML file, but I think that XML file is correct.

My code is

$Node = Resolve-DnsName xxxxxx -Type SRV | Format-List | findstr NameTarget <prtg>

$value = $Node.split(':')[1]

$xml_txt = "<prtg> <result> <channel>DnsName</channel> <value>+$value+</value> </result> </prtg>"

Write-Host $xml_txt </prtg>

Article Comments

The last line is wrong - you need to omit </prtg>, otherwise, it's duplicated :)


Jun, 2019 - Permalink

You're right, the last </prtg> is duplicated. I deleted it, but I still have the same error


Jun, 2019 - Permalink

Hm - Try the following:

<code> $xml_txt = "<prtg><result><channel>DnsName</channel><value>$($value)</value></result></prtg>" If that doesn't work, please check if step #1 of our Guide For PowerShell based Custom Sensors is fulfilled.


Jun, 2019 - Permalink

Execution Policy is unrestricted. Still doesn't work


Jun, 2019 - Permalink

Okay. Please enable the write result to disk option in the Sensor settings and send us the Sensor logs to support@paessler.com, referring to that thread. The logs reside in PRTGs data directory. Thanks in advance!


Jun, 2019 - Permalink

Mind if I ask what the actual value is, e.g. what the actual $value is here when executing it manually?


Jun, 2019 - Permalink

Here, $value is the result of SRV query (I need only the first part, so I splitted it)


Jun, 2019 - Permalink

And what would that be, for example?

PRTGapi | Feature Requests | WMI Issues | SNMP Issues

Kind regards,
Stephan Linke, Tech Support Team


Jun, 2019 - Permalink

I had to use it for some DNS for Skype for Business. So I had to resolve with an SRV query _sip._tls.domain.eu and the result contained in $value is access1.domain.eu

The sensor should check the result; if there is something different from access1.domain.eu, it must go down


Jun, 2019 - Permalink

Note that the content of t he <value> XML node must be numerical, as PRTG can't evaluate strings. Can you modify your script accordingly (e.g. 0 for ok and 1 for an error) and provide me with an example XML output afterwards?

PRTGapi | Feature Requests | WMI Issues | SNMP Issues

Kind regards,
Stephan Linke, Tech Support Team


Jun, 2019 - Permalink

I don't manage to do this easily I think I have to change too much


Jun, 2019 - Permalink

Okay - let us know if any assistance is required with that :)


Jun, 2019 - Permalink

Is it possible to add SRV option in your DNS sensor ? Maybe in future updates


Jun, 2019 - Permalink

You could put a feature request into the knowledge base (like outlined here) and provide all necessary info about what specifically you'd like to monitor. If other people find that useful, they'd vote for it and we can implement it, given that there is a demand for it :)


Jun, 2019 - Permalink