internet issues with mac OS 10.15.1

Hi @philipfromnorthridge

Best thing to do is scroll through all the answers here first - there are some really helpful guides. Certainly helped me with exactly the same problem.

Here's what I gleaned / did:-

• Checked if could connect via any browser (default browser is Safari, I also use Chrome & Firefox - mostly couldn't connect via any browser, and on those occasions when I did the connection / page load was so slow as to be painful [couple of mins for each load])
• Opened a WebPage Igonito in Chrome - still same issue
• Tried manually disabling installed "Addons / Extensions" - still same issue
• Rebooted Mac into Safe Mode (to see if any 3rd party App was interfering with connectivity) -
  • To load your Mac in Safe Mode, press and hold the Shift key while it boots. You can stop holding the Shift key when you see an Apple logo and progress bar. To leave Safe Mode, just reboot your Mac without holding the Shift key.
  • My Mac booted fine into Safe Mode and connectivity was perfect. This told me the problem was with a 3rd party App - in this case my Intego Security - but other people found a problem with other security software - it was the Firewall and fortunately Intego issued a fix within days of the macOS 10.15.1 release date.
• Updated all 3rd Party Software and try connecting again in "Normal" mode. When issues persisted, tried disabling the 3rd party software one by one to identify the culprit. Eventually identified Intego NetBarrier to be the problem and after multiple reporting an urgent fix was issued a few days later.
• Hope that helps!
• I usually wait a week or two before Installing Updates unless they comprise a Security Fix, and Google for Identified Issues & their fixes - didn't this time but will know better next time! Had to roll back to 10.15 via Time machine pending Intego Fix which wasted half a day's work o.0

I have had a similar problem with Safari, Chrome & Mail all unable to connect to the web. I updated Intego Net Barrier to 10.9.9 everything now works as normal. I didn't need to turn off Intego as it was able to connect to its servers.

I have a MacBook Air (the first in the series), an iMac (a couple of years old) and a MacMini (the model before the latest). I loaded the latest update and am experiencing the same problems as mentioned in this feed with my MacBook Air and iMac only. The MacMini is working fine. I have Intego software on all three. Some of the feedback/suggestions regarding Intego software doesn't make sense considering that my Mini is working with the update and the older models are not. I think it's quite odd that only my older model Macs are affected by this update.

If the issue is the same as for me it would be really easy to check. Open Netbarrier the go Netbarrier > Preferences and toggle the protection switch "off". See if the problem goes away, it did for me. Since then Intego has released an update that solved the problem. I have protection toggled back on everything is working normally.

Mike

I had the same problem when I updated to the 15.1 recent update. Both my MacBook (using wifi) and my iMac (using ethernet) would show very slow internet after a few minutes with pages failing to load. I'd have to disconnect and reconnect from the network and reboot, only to have it happen all over again in a few minutes. Doing this simple thing solved my problem: on both machines: I disabled Intego net barrier ("turn protection off") and enabled the native MacOs firewall instead (system preferences, security and privacy, firewall). Problem solved! No reboot required even. I expect Intego will fix the problem in Net Barrier in their next update. I think the antivirus/anti-malware (virus barrier) provides useful protection, despite the urban legend that MacOs doesn't need it. I wouldn't uninstall the whole thing, that would be throwing out the baby with the bathwater. The antivirus software after years of use, at least by me, has never caused any problems ever, so at least keep that. I don't know if you can uninstall just the firewall, but if you just disable it and wait awhile Intego will likely provide a fix. Hope this works for you.

Had exactly the same issue after I updated my wife’s MBA to Catalina 10.15.1. Instantly had network connectivity problems despite resetting the WiFi router. Tips on this site got me out of the dog house with my wife... complete uninstall of Trend Micro and machine back to normal. Whew!

I booted in Safe Mode and had some limited connectivity. On a whim, I decided to look at the advanced features under network preferences, and made my way over to the DNS tab. I added a couple of DNS servers to the list (Google and Cloudfare). I got the info for those DNS servers from Lifewire.com. After adding the primary and secondary servers for both, I found that my internet speed picked right up. I rebooted in normal mode, confirmed that the additional DNS servers were available, and connected to the internet without any issues. I am not running the antivirus softwares that others on this thread are using, but I do have Sophos installed as a precaution because I use Parallels to run Windows 10 for work. I didn't try uninstalling Sophos before updating my available DNS servers.

I had to roll back to 10.15 (Restore from Time Machine backup) - working fine again now although Intego DID release a fix to address connectivity issues. Waiting a few more weeks now though to see whether other peoples issues resolved before attempting to install again.

@Birkhoff92 Thanks for the tip - but tried all the usual solutions - checked network settings, clean install, safe mode boot up (which worked but neither Apple nor I were able to identify the offending 3rd party or Apple bug) - so I simply rolled back until the problem is more definitively identified or until all the 3rd party apps I use have issued fixes - it’s highly likely that the offending App was Intego though - a patch has been released but will wait a little longer before trying again - wasted whole day’s work attempting to fix the issue on the previous pass :(

Yep did (read up) my contribution was an added observation by way of confirmation that the issue was probably (can’t be definite) with Intego and not Apple - but I’m waiting a little longer before attempting to reinstall. Also don’t entirely agree that Intego is useless - both MalwareBytes AND Intego have found issues for me in the past albeit in Intego’s case Infected attachments (major supplier had been hacked / infiltrated and it’s emails were spamming attachments) but that was still a plus that potentially saved me hours of work / cash so will keep them running - the correct approach I think is as another poster intimated is to wait and scour forums for issues before proceeding UNLESS the Update is a major security release in which case install ASAP - that’s what I usually do - but unfortunately didn’t on this occasion ^^o

Don’t disable Intego or Trend Micro yet (if you have it installed). Check for an update first.

I was experiencing slow internet, sometimes it simply stalled, but a recent Intego update fixed all my internet issues. Now, it runs like a dream.

Check all of your third party software for updates before reverting to drastic measures like disabling or uninstalling/reinstalling anything.

I had same issue with 10.15 and 10.15.1 where connection randomly went off then the macbook pro fan started to get loud. also my wifi and internet worked with other devices.

Today I Turned off and deleted ESET endpoint security and internet is working fine.

Upgraded my late 2013 MacBook Pro to Catalina and it developed some little weirdnesses-mostly involving files not saving with the correct file extensions. Updated to 10.15.1 and started having internet connectivity problems. Updated my iPhone 7 to 13.2 and it is having the same problem. Web pages will not load in Safari or chrome. Used Suddenlink/Altice online troubleshooting tools and wasted over an hour and a half waiting on telephone tech support to do an operational check on my modem which was a massive waste of time. Tested/checked everything I could find ... nothing helped.

Got desperate and went to the Public library and logged on to their secure WiFi - everything worked. Came home and set up new modem. Didn’t help. New router didn’t help. Completely changed WiFi SSID and passwords to force a new connection, didn’t help. New cables didn’t help.

It seems like this is not my computer/iPhone’s problem, not my WiFi equipment. Logging on in safe mode didn’t help.

I don’t know what else to check - 6 years and I’ve never had to troubleshoot my MacBook. Does anyone have suggestions on what else I might check?

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.