Unable to contact NTP servers

The controller is unable to contact any of its configured NTP servers.

Important:
  • If at least one of the controller's management ports are configured via DHCP, the controller may be able to automatically detect NTP and DNS servers from your DHCP server.

  • If neither of the management ports are configured via DHCP, or you do not wish the controller to use the NTP or DNS servers from your DHCP server's configuration, you may provide static addresses for the controller to use instead.

  • If a static NTP server's domain name is provided, a DNS server must also be configured on the controller to resolve the servers IP address. You may configure a DNS server for the controller in the Configure Domain Name System Server dialog by selecting the Hardware > Controller > Configure > DNS Server menu option.

Recovery Steps

  1. Confirm that the controller has at least one valid NTP server configured.

    1. Open the Configure Network Time Protocol Server dialog by selecting the controller listed in the Details area, and then the Hardware > Controller > Configure > NTP Server menu option.

      If... Then...
      The controller is set to obtain NTP server addresses automatically Go to step b.
      Static NTP server addresses have been specified Check the following:
      • Are the provided addresses correct?

      • Are the NTP servers functioning properly?

      • Are the NTP servers reachable from the controller given your network configuration?

      If the answer to any of the above questions is no, correct the problem and go to step 3. If the answer to all of the above is yes, go to step c.

    2. Check if the controller can detect any NTP servers from your DHCP server.

      If... Then...
      NTP servers are being detected Check the following:
      • Are the detected addresses correct?

      • Are the NTP servers functioning properly?

      • Are the NTP servers reachable from the controller given your network configuration?

      If the answer to any of the above questions is no, correct the problem and go to step 3. If the answer to all of the above is yes, contact your Technical Support Representative.

      No NTP servers were detected and at least one of the controller's management ports are configured via DHCP Add at least one NTP server to your DHCP server's configuration or specify at least one static NTP server address and go to step 3.
      No NTP servers were detected and neither of the controller's management ports are configured via DHCP Specify at least one static NTP server address and go to step 3.
    3. Check the format of the NTP server addresses.

      If... Then...
      The NTP server addresses are specified in IPv4 or IPv6 format Contact your Technical Support Representative.
      The NTP server's domain name is specified Go to step 2.
  2. Confirm that the controller has at least one valid DNS Server configured.

    1. Open the Configure Domain Name System Server dialog by selecting the controller that is listed in the recovery guru Details area, and then the Hardware > Controller > Configure > DNS Server menu option.

      If... Then...
      The controller is set to obtain DNS server addresses automatically Go to step b.
      Static DNS server addresses have been specified Check the following:
      • Are the provided addresses correct?

      • Are the DNS servers functioning properly?

      • Are the DNS servers reachable from the controller given your network configuration?

      If the answer to any of the above questions is no, correct the problem and go to step 3. If the answer to all of the above is yes, contact your Technical Support Representative.

    2. Check if the controller can detect any DNS servers from your DHCP server.

      If... Then...
      DNS servers are being detected Check the following:
      • Are the detected addresses correct?

      • Are the DNS servers functioning properly?

      • Are the DNS servers reachable from the controller given your network configuration?

      If the answer to any of the above questions is no, correct the problem and go to step 3. If the answer to all of the above is yes, contact your Technical Support Representative.

      No DNS servers were detected and at least one of the controller's management ports are configured via DHCP Add at least one DNS server to your DHCP server's configuration or specify at least one static DNS server address and go to step 3.
      No DNS servers were detected and neither of the controller's management ports are configured via DHCP Specify at least one static DNS server address and go to step 3.
  3. Wait one hour for the controller to re-query the specified NTP servers. If the failure does not disappear after one hour, recheck the controller's NTP and DNS configuration and then contact your Technical Support Representative.