Symantec endpoint server not updating

Security software is another major culprit responsible for DNS Server Not Responding error.

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The solution mentioned below is simple and it worked very well for me.Then I tried the diagnostic tool link that popped up in the webpage, which showed me DNS Server Not Responding Error.After performing some troubleshooting, I was able to fix the issue. Sometimes the problem might be as simple as shutting down and turning on modem/ router.The logic is to check if it as a browser related problem.All my web browsers had the same issue which confirmed, this is not a browser problem.