iMac being blocked from website on all browsers

I'm not sure what is causing this but for 2 weeks when trying to access a suppliers website that I regularly use, I get a popup warning that my connection was not private. It indicated that there was something wrong with their website certificate... even after I selected to trust the certificate and proceed to site, it still would not let me access the site. I turned off my anti virus software, cleared the cache, restarted, no change. The same issue happens in all browsers. I called them to inquire and they said there is no problem with their site... know one else is having any issue accessing the site. I have no problem accessing the site on my iphone, ipad which is connected to my wifi. Have no idea what would cause this or how to fix it?

Thanks for any help.

iMac 27", macOS 10.12

Posted on Feb 17, 2020 6:20 AM

Top-ranking reply

rkaufmann87

Level 10

148,494 points

Posted on Feb 17, 2020 7:57 AM

Your issue is likely caused by Avast. Mac OS is extremely secure and does not benefit from nor does it require ANY third party antivirus, cleaning or any other types of "maintenance" apps. Most have the exact opposite effects that users want, they make their Mac slow and unstable and exhibit behavior similar to what you are experiencing. All Mac OS needs to remain stable is to be kept up-to-date and otherwise left alone.

Please post a EtreCheck report of your system and we can then look for any other issues due to what has been installed on the computer.

Please locate the uninstall instructions for Avast (and any other similar products as described above) and please uninstall. dialabrain is 100% correct, please follow the advice. If you don't want to, that's okay but there is not anything we can do to assist.

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iMac being blocked from website on all browsers

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