internet issues with mac OS 10.15.1

Logically, the only other thing left is your ISP since it worked at the library. Do you know any other people using you ISP with Apple devices having similar problems? This would be unlikely if you are using a big outfit like ATandT, but if it is a small "mom and pop" ISP maybe it is something at their end? Also one other thing you could try is to go into your router's settings and change the DNS server IP addresses from that which your ISP uses to use Google's DNS server (address 8.8.8.8 and 8.8.8.4) or OpenDNS (208.67.222.222 and 208.67.220.220). It's a long shot but worth a try as it is much easier to do than most of the stuff you've tried already. Good luck.

Thanks but things are operational now. I managed to get some connectivity last night but a slooooooow 15mbps. Gave up for the night and the router was not working this morning. Rebooted. Got a connection back but the speed was still appallingly slow. Tried to go in and configure the new TP-Link router but their interface was mostly incomprehensible. Crossed my fingers and snuck the old router back in. It configured with absolutely no problem and miraculously I have WiFi again.

Don't really know why, maybe Suddenlink updated something overnight after the new modem was activated. It wasn't a total waste of time - I now have a blazingly fast 270mbps wireless connection. All I have left to do is reconnect every WiFi gadget in the house. Thrills.

I don't have any Intego or similar SW in my MacBook Pro, but got the same problem after upgrade to macOS 10.15.1.

I was able to get connection just after I tried a 5.0 GHz wireless network. The 10.15.1 update made it impossible to connect to 2.4 GHz band. Try a 5.0 GHz network, at least until another update (hopefully) solves this issue.

I have a similar issue after upgrading to 10.15.1 - I am running Palo Alto Global Protect and Sophos Anti-Virus. Within the last two days, I have started to notice an issue where my WiFI disconnects and then the macbook pro fan runs really loudly. The only way to resolve this I've found, and connect to wifi again, is to disable my wifi, and then re-enable and I can connect. The fan eventually drops back down to normal speed.

Appreciate you posting that link on virus/malware protection. I recently migrated to Apple ecosystem and I had no idea third party virus/malware protection was not only useless but detrimental to the macOS.

I agree with you. I am able to access the internet via wifi, but not via ethernet. I can however access our local network via ethernet. Both use the same ISP. A co-worker is experiencing the exact same issue. Very strange....the issue manifested itself after we both upgraded to 10.15.1. Anyone have any ideas?

Thanks for the direction. The DNS was different for the Ethernet, so I changed it to match the WiFi. Unfortunately still the same behavior, note too that they both show as "connected" with a green dot under System Preferences->Network

Possibly Catalina is not the issue. On my network there is a managed, externally powered switch before the router. For me it would be possible to connect the the router with wifi but not ethernet if there was a problem with the switch. I would be able to connect to my NAS, and Apple TV. Although my Apple TV would not be able to connect to the internet since its hardwired.

Mike

Mike you may be on to something. I'll play around with bypassing the switch with the ethernet connection. It wouldn't be the first time I had unrelated simultaneous glitches that made diagnosing a real challenge. I originally discounted the switch because we have five computers, two Macs and three Win. PCs, it's only the two Macs that are having connectivity issues.

hey all,

went thru lots of threads and troubles - nothing worked until i found a footnote on INTEGO software i also was running on my mac.

MANUALLY deleted all of it (search for INTEGO on your mac, drop all results into the bin & empty trash. restart mac) and my problems are gone!

good luck to all you brave catalina installers ; )

hey all,

went thru lots of threads and troubles - nothing worked until i found a footnote on INTEGO software i also was running on my mac.

MANUALLY deleted all of it (search for INTEGO on your mac, drop all results into the bin & empty trash. restart mac) and my problems are gone!

good luck to all you brave “catalina pioneers“ ; )

Hi, Yeah this issue is mentioned several times higher up the thread along with generic references to Security Software interfering (Net barrier etc). Just FYI, Intego issued a fix pretty quickly after the issue was first reported and now works fine.

I had the same problem, and called Apple support, and they told me it's a 10.15.1 problem and that until 10.15.2 comes out (soon, hopefully) I have to always boot in safe mode. We stripped out all apps, shut down everything else, and did Disk Aid first, but nothing helped until he had me boot into safe mode.

That advice is complete BS.

As you can see by reading this thread there are several solutions depending on what is the actual cause for you. The most egregious example in the thread is intego, but there are also other causes and there is always a solution.

Luis Sequeira1, "Disabling" them does NOT solve the problem. You should learn the difference between mitigation of symptoms, and solving issues. Disabling them mitigates part of the issue where the loss of whatever function of that third party software results in restoring communication. You do not get to decide what functionality is valid or reasonable - furthermore, you're not the CIO or CISO of businesses that may require such software. There are tons of issues associated with Catalina.