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Fixed in 2021.2.X

Fixed in 2019.4.X, 2020.2.X, 2021.1.X



Found in




Issue ID




Adding event handler to NetworkChange.NetworkAvailabilityChanged crashes the Linux Editor at "mono_dl_fallback_unregister"



How to reproduce:
1. Open the user attached project (
2. Enter and leave playmode several times until a crash occurs

Reproducible with: 2019.4.15f1, 2020.1.14f1, 2020.2.0a5, 2020.2.0b13, 2021.1.0a6
Not reproducible with: 2018.4.29f1, 2020.2.0a4

1. Reproducible on Ubuntu 18.04
2. On Windows 10 a "PlatformNotSupportedException" is thrown
3. The build of the project doesn't crash

  1. Resolution Note (fix version 2021.2):

    Fixed issue where CreateNLSocket on posix systems would return an incorrect handle.

    Fixed in 2021.2.0a2

  2. Resolution Note (fix version 2021.1):

    Fixed in 2021.1.0b5

  3. Resolution Note (fix version 2020.2):

    Fixed in 2020.2.5f1

  4. Resolution Note (fix version 2019.4):

    Fixed in 2019.4.20f1

Comments (1)

  1. RomainSepulchre

    Feb 15, 2022 21:47

    Hello, I have this issue on a windows 10 with Unity 2021.1.15f1. When I try to add an event to NetworkChange.NetworkAvailabilityChanged I have a "PlatformNotSupportedException" I also tried to upgrade my project to the last 2021.1 version (2021.1.28f1) but I still have the same issue. It happens everytime I try to add an event in editor and in a build

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