What is block.opendns.com?

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Level 1

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What is block.opendns.com?

When I attempt to visit certain websites, like support.apple.com, I get redirected to block.opendns.com, with a warning message, and a strange picture of a man. Is this malware?

MacBook Air, macOS High Sierra (10.13.5)

Posted on Jun 26, 2018 8:23 PM

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Answer 1

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Kappy

Level 10

361,741 points

Jun 26, 2018 10:57 PM in response to drisendal

OpenDNS is a site that offers a free DNS server and data encryption services. I suppose block.opendns.com is for some anti-malware software or Safari extension that tries to block OpenDNS from running or invokes OpenDNS to block the site you are trying to access. This isn't an Apple product nor part of macOS. It's third-party software you installed.

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Answer 2

Kappy

Level 10

361,741 points

Jun 27, 2018 3:46 PM in response to drisendal

Fixes for Adware and Pop-ups

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Answer 3

drisendal Author

Level 1

5 points

Jun 27, 2018 7:59 AM in response to Kappy

When I attempt to log in to apple.com I get a dialog box reading: This Connection Is Not Private. This website may be impersonating “www.apple.com” to steal your personal or financial information. You should go back to the previous page.

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Answer 4

drisendal Author

Level 1

5 points

Jun 27, 2018 3:47 PM in response to Kappy

Malwarebytes did the trick for me. Thank you!

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Answer 5

drisendal Author

Level 1

5 points

Jun 27, 2018 7:54 AM in response to Kappy

Now the behavior seems different.

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Answer 6

drisendal Author

Level 1

5 points

Jun 27, 2018 8:04 AM in response to Kappy

And when I browse to support.apple.com I get: Safari can’t open the page because Safari can’t establish a secure connection to the server “support.apple.com”.

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What is block.opendns.com?

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