IP over Thunderbolt issue: Mac to Windows fails on macOS 26.2 (Mac to Mac works)

App & System Services Core OS
jim_shiau OP
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Hi everyone,

I’m running into an issue with IP over Thunderbolt connectivity between my Mac and Windows PC after updating to macOS 26.2.

Previously, this setup worked fine on macOS 15. However, since the update, I haven't been able to establish a connection.

Here is what I have tested so far:

  1. Mac M1 and Mac M3 (Updated to macOS 26.2): Both are unable to connect to Windows.

  2. Mac M2 (Running macOS 15.4): This device still connects to Windows without any issues.

  3. macOS 26.2 (Mac M1) <-> macOS 26.2 (Mac M3): Connection successful.

Since my M3 Mac worked correctly before the update (when it was on macOS 15), and Mac-to-Mac connection still works on the new OS, I have a few questions:

  • Is there a new setting I need to configure?
  • Has this feature changed in macOS 26?
  • Could you please confirm if IP over Thunderbolt connections to Windows have been explicitly blocked or deprecated in macOS 26?

Thanks for any help!

Mac M3 macOS 26.2 FAIL

Mac M2 macOS 15.4 OK

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IP over Thunderbolt issue: Mac to Windows fails on macOS 26.2 (Mac to Mac works)
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