Certificate error during new garylog-server installation

I am trying to install a new graylog-server setup on Ubuntu 16.04. So far I was able to install Elasticsearch, MangoDB. The process where I am stuck is adding the graylog repository. It is giving a insecure certificate error.

ERROR: cannot verify packages.graylog2.org’s certificate, issued by ‘CN=COMODO RSA Domain Validation Secure Server CA,O=COMODO CA Limited,L=Salford,ST=Greater Manchester,C=GB’:
Issued certificate not yet valid.
To connect to packages.graylog2.org insecurely, use `–no-check-certificate’.

I even tried by passing `–no-check-certificate’ parameter, but then it fails to update the repositories cache and says update failed old cache is used.

Can someone please help?

Make sure that the hardware and system clock of that machine is working correctly.

Hi Jochen,
Yes, My VM had the correct timezone but my VMware host timezone was not in sync. Making them in sync resolved the issue.

Thank you for your quick resolution.
Jimit

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