Network connection lost after sleep mode

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Level 1

8 points

Network connection lost after sleep mode

Hi,

my iMac with catalina os cant browse any more after a long sleep mode, the strangest thing is that i can still ping to the urls and get a reply.

i already cleared my network settings, changed the order, changed the dns to 8.8.8.8 without succes, i even reinstalled macos to fix it without success.

this event took place after the upgrade of the os. How can i fix this?

and when this event happens, the computer isnt able to shut down in a normal way so i have to force it, after reboot there is no problem anymore.

my mac is from late 2015

regards,

Peter

iMac 21.5", macOS 10.15

Posted on Nov 27, 2019 10:55 PM

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Answer 1

Joseph_S.

Community Specialist

Dec 2, 2019 7:03 AM in response to Black-Dragon

Hello Peter,

Thanks for reaching out to the Apple Support Communities. From your message I see you're having an issue with your iMac having some issues shutting down, and connecting to the internet after being in sleep.

For the issues with not shutting down as expected, try resetting the System Management Controller (SMC), following these steps: How to reset the System Management Controller (SMC) on your Mac.

For the issue where the Wi-Fi is not connecting, if it continues after resetting the SMC, remove the public DNS and allow your modem to assign the DNS. See if there is any change when you go to use Safari to access a website. Message back with the results.

Cheers!

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Answer 2

Black-Dragon Author

Level 1

8 points

Dec 11, 2019 8:23 AM in response to Joseph_S.

Hi,

First of all thanks for your reply. It didn't work. But I've found the cause.

The avast antivirus/vpn was causing the problems. After removing it and reïnstalling it the problem was solved.

Regards.

Peter

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Answer 3

MoonJ.

Community Specialist

Dec 12, 2019 8:12 AM in response to Black-Dragon

Hi Black-Dragon,

Thanks for messaging back and letting us know what was causing the issue. If you have any questions down the road, we're only a message away.

All the best!

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Network connection lost after sleep mode

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