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Logon failure: The specified username is invalid(2202) (code: PE029)

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I'm getting this error when accessing a shared folder on a Windows system. I know for sure that the domain (.\), the username (administrator) and the password are filled in correctly at the device settings for the sensor, and I've followed all described procedures in the diverse topics related to this error, but still no success. I can actually open the shared folder on the commandprompt of the PRTG monitor server using the credentials, so all network related options are correct (no firewalls, virusscanners or what so ever blocking). Any suggestions?

credentials share windows

Created on Jun 27, 2017 8:17:59 AM by  gesture (50) 1 1



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Sorry, but it was the Windows firewall on the targetcomputer :( It only accepted a few IP addresses, and one of the addresses was the one I was testing from. The PRTG monitor server IP address had to be added.

Created on Jun 28, 2017 7:26:16 AM by  gesture (50) 1 1



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Hi there,

Please try the FQDN of the device as the "Windows Domain" instead of a point. So change the ".\" to the hostname of the monitored device. Does it work afterwards?

Best regards.

Created on Jun 27, 2017 8:34:16 PM by  Dariusz Gorka [Paessler Support]



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Sorry, but it was the Windows firewall on the targetcomputer :( It only accepted a few IP addresses, and one of the addresses was the one I was testing from. The PRTG monitor server IP address had to be added.

Created on Jun 28, 2017 7:26:16 AM by  gesture (50) 1 1



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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.