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Fixed in 2021.2.X

Fixed in 2019.4.X, 2020.3.X, 2021.1.X



Found in






Issue ID




Dns.GetHostEntry malfunction in IL2CPP builds



Reproduction steps:
1. Open user attached Project
2. Open Assets\Scenes\SampleScene
3. Build and Run a Dev build using IL2CPP

Expected result: There are no errors in the console
Actual result: There's an error in the console

Reproducible with: 2019.4.24f1, 2020.3.5f1, 2021.1.4f1, 2021.2.0a14

Notes: Does not reproduce with the Mono backend

  1. Resolution Note (fix version 2021.2):

    Fixed in 2021.2.0a16

  2. Resolution Note (fix version 2021.1):

    Fixed in 2021.1.10f1

  3. Resolution Note (fix version 2020.3):

    Fixed in 2020.3.12f1

  4. Resolution Note (fix version 2019.4):

    Fixed in 2019.4.29f1

Comments (1)

  1. NNSkelly

    Apr 13, 2021 21:29

    For readers, bug is specifically with passing string.Empty ('') to GetHostEntry. Microsoft official docs state that this should return the machine's current IP address(es), and indeed this is the most common forum/stackoverflow advice for detecting this information at runtime. In editor and in Mono builds, the invocation works as such, but in IL2CPP builds, it results in an error
    SocketException: Could not resolve host ''
    with a chain of 0000 addresses in the quoted stacktrace

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