This article applies to PRTG Network Monitor 13 or later

Monitoring Free Disk Space on VMware ESX(i): Unable to Parse Reply Data — Code PE094

If your SSH VMware ESX(i) Disk sensor shows the error code PE094, claiming that the monitored device is not compatible and, thus, parsing the received data is not possible, there might be an issue when executing the df (disk free) command.

Running the df command in a shell, the output probably looks like this: ~ # df Traceback (most recent call last): File "/sbin/df", line 99, in <module> sys.exit(main(sys.argv)) File "/sbin/df", line 53, in main o = eval(output) File "<string>", line 1 Errors: ^ SyntaxError: invalid syntax

This issue often appears when the VMware host is installed on a USB drive. ESX(i) needs a working local USB storage when it boots from USB to be able to make the disk free command work. However, when the USB drive disappears from the system, VMware ESX(i) cannot issue the df command.

Please ensure that you have a local storage for your ESX(i) system to avoid the PE094 error!

Please make also sure that

• you use the correct credentials for the ESX(i) host,
• that SSH is enabled on the ESXi host,
• and also try increasing the Shell Timeout in the sensor settings.