I am using a custom sensor using a Powershell script. I have copied this script on 2 different probes (1 W2K3 and 1 W2k8R2) on the EXEXML directory. This sensor is working on the monitored servers under the W2k8R2 probe, but not on the servers under de W2k3 probe. The error message is the same "Error reading response: Invalid XML (missing /prtg)", and in the Logs (Sensor) directory the error is like "Object reference not set to an instance of an object" When I run the script manually on the server all is fine, and the XML format of the return is correct.
The Execution policy is correctly set.