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NSPOSIXErrorDomain:40

It is from 2 days that some web pages (in particular Google.it) do not load, instead a white page appears with this error: "Safari cannot open the page. The operation could not be completed. Message too long. NSPOSIXErrorDomain:40". It only happens when I'm using the LAN cable and Safari. When I switch to the Wi-Fi connection, this error disappears.

The Safari version is 15.4 with a MacBook Pro M1 and MacOs 12.3.

How can I fixed this problem?

MacBook Pro 13″, macOS 11.1

Posted on Mar 21, 2022 10:32 AM

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Question marked as Top-ranking reply

Posted on Mar 21, 2022 11:10 PM

I'm having this problem too.

Sites like Google, Facebook, Instagram, Youtube... do not enter.

I did the following experiments that didn't work:

- I changed the DNS of the ISP router;

- I restarted the ISP router several times;

- I turned off private relay (websites and trackers).

- Removed extensions

- Cleared caches and cookies


Experiments that worked:

- Accessing the same sites through Chrome;

- Using Safari in private mode;

- I used the internet from the iPhone (LTE);

- And the change that had the best effect was to disable the Firewall in the system preferences.


I'm using a Macbook Air M1 - 2020 - Monterey 12.3

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5 replies
Question marked as Top-ranking reply

Mar 21, 2022 11:10 PM in response to c41e97

I'm having this problem too.

Sites like Google, Facebook, Instagram, Youtube... do not enter.

I did the following experiments that didn't work:

- I changed the DNS of the ISP router;

- I restarted the ISP router several times;

- I turned off private relay (websites and trackers).

- Removed extensions

- Cleared caches and cookies


Experiments that worked:

- Accessing the same sites through Chrome;

- Using Safari in private mode;

- I used the internet from the iPhone (LTE);

- And the change that had the best effect was to disable the Firewall in the system preferences.


I'm using a Macbook Air M1 - 2020 - Monterey 12.3

Mar 22, 2022 7:38 AM in response to micronano

Thank you very much for these advices. I've already used Chrome, but since I prefer to use Safari, disabling the Firewall works better.


However, I still don't understand why the Wi-Fi connection works when using the same network as the LAN connection, which doesn't work, so suddenly. It is a little bit frustrating...

NSPOSIXErrorDomain:40

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