Level 1

24 points

macOS Sequoia LAN is totally unstable!

I've been having disconnection issues on SSH, VNC and SMB, since I installed macOS Sequoia, to the point that I couldn't keep an SSH connection up for over 5 minutes! In the beginning I thought it was just SSH, so I was trying different settings, different MTU which made it a bit more stable, I even downloaded a version of the SSH client that uses OpenSSL instead of LibreSSL that the macOS is using, but I was getting disconnections with corrupted packets of a huge random 32bit number invalid length. I was using a Realtek ethernet adapter, so I tried eleven different ones without success. I even dug out my old Apple Thunderbolt 2 to ethernet adapter, combined with a Thunderbolt 2 to 3 adapter, which showed a better behaviour on SSH. Using WireShark to capture the connections when they were failing didn't help, since the invalid packet length number wasn't anywhere to be found in the packet itself, as it was most likely on the SSH application layer, and thus encrypted.

However when I was trying to do a tar backup of 4TB SSD on my Synology NAS, the NAS kept disconnecting anytime from 10min to 120min randomly, completely destroying my backup and having to start it over. VNC connections on my Raspberry Pi weren't any different than the SSH.

I thought it was planned obsolescence for my 2019 Intel Core i9 MacBook Pro, but I've heard from others having M2 MacBooks having similar issues.

Is there any suggested solution?

MacBook Pro 16″

Posted on Oct 3, 2024 11:09 PM

Top-ranking reply

skesinis Author

Level 1

24 points

Posted on Nov 5, 2024 5:19 PM

@satcomer

It was just a bug of the early Sequoia version 15.0 and 15.0.1

It’s fixed now on 15.1

The NAS was just a special case where I had a failing SSD for cache (2 of them in RAID1, 1 of them failing) and it was taking too long to write or read sometimes, thus it was disconnecting the NAS as an SMB device.

However, the SSH issue was happening everywhere I was trying to connect. It would disconnect within a few seconds to a few minutes with an error about an invalid packet length, followed by a random 32bit number, usually over 3billion bytes. That was happening on the application layer (thus encrypted), because WireShark wouldn’t find that number in any of the packets.

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25 replies

etresoft

Level 9

56,314 points

Oct 5, 2024 12:01 PM in response to D3vildog76

D3vildog76 wrote:

@etresoft while help, is helpful you're prescribing level 1 support concepts to a (original issue) poster that is level 3 all day long.

I have no idea what you are talking about with level 1s and level 3s.

Many people are having general networking problems with Sequoia. In this situation, anyone having such problems must confirm that they have gone through all of those steps. Otherwise, any attempts to help or any further attempts to diagnose the problem are a total waste of time for everyone.

These networking problems affect all protocols. They absolutely must be eliminated before discussing a notoriously complicated protocol like SMB.

As far as SMB goes, I have no idea what people are doing when they report problems with Sonoma or Sequoia. In every case, they always claims it was perfect before the upgrade. But I've used Mac networking with SMB and I know that is has always been far, far from perfect.

andr3w

Level 1

19 points

Oct 15, 2024 5:00 PM in response to etresoft

The OP does not appear to be using WiFi, but rather wired Ethernet. Does the WiFi setting mentioned at (1) have some effect on Ethernet networking too? I didn't see a "Private WiFi Address" option when I looked just now, but perhaps that's because I have WiFi on but not connected (on for location services, not connected because of Ethernet). Doesn't appear to be a "Private" option for Network > Ethernet either.

skesinis Author

Level 1

24 points

Oct 17, 2024 10:45 PM in response to skesinis

It looks like it's been fixed in yesterday's update (17/10/2024), but you may want to wait until 15.1 is out. I had it though from the very beginning of installing Sequoia, so it wasn't related to a release which I wouldn't want to mention here (other than the date), if I don't want my response to be automatically deleted.

Oct 19, 2024 9:08 AM in response to D3vildog76

It's not just SMB. My brand-new shared-over-afp NAS keeps disconnecting mid Time Machine backup. I've been seeing strange disconnections in ssh, and even acquiring an IP address by DHCP has been dodgy.

Oct 7, 2024 6:43 AM in response to skesinis

I didn't see ssh disconnection issues with macos 15 until upgrade to 15.0.1 :-(. Now, all LAN connections are unstable and unusable. I hoped Apple come up with another update to fix the issue.

SerPom

Level 1

14 points

Oct 11, 2024 6:50 PM in response to skesinis

I started having stability issue and also after updating my M1 Imac Safari started freezing.

etresoft

Level 9

56,314 points

Oct 14, 2024 4:41 AM in response to idjwert

idjwert wrote:

Suggesting people run without any firewall at all, or without their security apps, is TERRIBLE advice. ABSOLUTELY TERRIBLE.

Please explain why.

Oct 19, 2024 8:37 AM in response to Ken__

exact the same issue here

Oct 20, 2024 7:49 AM in response to QINirvana

Many thanks. so far, your suggestion is working on my macbook.

Nov 10, 2024 5:45 AM in response to MrHoffman

Thank you for the detailed explanations, I have tried tccutil but the issue is still existing.I will try to re-install and see if will solve the issue.

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macOS Sequoia LAN is totally unstable!