QNetworkReply::UnknownNetworkError on macOS 27 Public Beta 2

Author: jorys-paulinCreated Jul 26, 2026Updated Sep 16, 2026
Labelsexternal issue

Describe the bug Moonlight fails to reach out to hosts when running on a Macbook M2 running the mac0S 27 Public Beta 2. Manually adding a host causes a QNetworkReply::UnknownNetworkError. Reaching out to the same host using ping or using a web browser on the same machine doesn't cause any errors and works as expected.

Steps to reproduce

  • Launch Moonlight on a computer running macOS 27 Public Beta 2.
  • Wait a bit for Moonlight to reach to hosts on the network
  • Close Moonlight and inspect the produced logs

Other Moonlight clients No other clients have been tried so far.

Moonlight settings

  • mDNS has been disabled
  • mDNS hasn't been re-enabled to test if it changes anything

Client PC details

  • OS: macOS 27 Public Beta 2
  • Moonlight Version: v6.1.0
  • GPU: Apple M2

Server PC details

  • OS: Windows
  • Sunshine or GeForce Experience version: Sunshine
  • GPU: Unknown
  • GPU driver: Unknown

Moonlight Logs Moonlight-1785061501.log

Additional context This issue is being created on behalf of an user on the Moonlight Stream Discord server because they don't have a GitHub account. Their original message can be found here: https://discord.com/channels/352065098472488960/465369864534491146/1530881665122177034. This user has two computers detected on their network, the one used for the test has the address 192.168.100.90.

Source: moonlight-stream/moonlight-qt