Clock Drift Monitoring N-able

Fix Clock Drift Monitoring error on N able N central

Clock Drift monitoring service on N able N central, monitors if the clock is running at the correct time on the server or not. It basically matches the time on the server with an authoritative time such as a public NTP server or one of your choice.

However, sometimes the monitoring service comes up with errors when there is a problem with the configuration. This blog post is about one such error.

201 Cannot convert value “rror: 0x800705B” to type “System.Double”. Error: “Input string was not in a correct format.” At line:158 char:1 + $global:resultoffset = [double]$stat; + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : InvalidArgument: (:) [], RuntimeException + FullyQualifiedErrorId : InvalidCastFromStringToDoubleOrSingle

Here is how you can fix the error on N able N central:

  1. Open the Monitoring service on N Central and check the NTP server that it uses as its Authoritative server. By default it will be unless configured otherwise.
  2. Try to ping the NTP server in Step 1 from the server. Most likely, there will be no response to the ping requests from the server.
  3. This is caused by a connection issue to the NTP server. Because the N Central Agent is unable to connect to the NTP server, it is not able to pull the time data because of which the monitoring service shows up with a misconfigured error.

This is most probably because the firewall is blocking the connection from the device/ N Central Agent to the NTP server. In order to fix this, we need to allow this connection on the firewall.

Once the connection is allowed, you should be able to receive a ping response from the NTP server which means that the connection is working now.

In a few minutes, depending on the service scan interval, the service should be back to normal with the correct status as per the time on the device.

Also, if you find that RDP connections are not working on your N able N central platform, you can find its resolution here in this blog.


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Sreehari Kartha
Sreehari Kartha

Sreehari Joined Infrassist in 2013 as a NOC engineer. He currently works with us as a senior engineer and Tech lead specializing in Sophos XG and Sophos Central with extensive experience in Microsoft Office365, Servers, Exchange, and Anti-Spam Gateway solutions like Mimecast and SolarWinds N-able Mail Assure.

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